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Tytuł:
XANES Experiments for High-Temperature Superconductors
Autorzy:
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1920888.pdf
Data publikacji:
1992-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.-b
76.30.-v
Opis:
The paper presents the results of XANES (X-ray Absorption Near Edge Structure) experiments, of the high-temperature superconductors of Y-Ba-Cu-O-type carried out at the Cu L$\text{}_{II,III}$- and O K$\text{}_{I}$-edges using synchrotron radiation and the KMC double monochromator and SX-700 grading monochromator beamlines of BESSY/Berlin synchrotron storage ring. The aim of the paper is to show that the XANES studies are well suited for characterization of the local electronic structure of the high-temperature superconductors.
Źródło:
Acta Physica Polonica A; 1992, 82, 2; 273-281
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Freshwater molluscs of the Wigry National Park
Autorzy:
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/84345.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
freshwater mollusc
mollusc
Wigry National Park
Lake Wigry
animal species
malacofauna
Potamopyrgus antipodarum
Dreissena polymorpha
Źródło:
Folia Malacologica; 1999, 07, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscs on Characeae in an oligotrophic Hancza Lake (NE Poland)
Autorzy:
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/83075.pdf
Data publikacji:
1999
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
In the littoral of an oligotrophic Hańcza Lake molluscs were the second most abundant group (next to Asellus aquaticus (L.)) of invertebrate macrofauna on Characeae (17%–34% total abundance). Thirteen taxa were found, with a distinct dominance of Dreissena polymorpha (Pall.); in some sites the proportion of Valvata cristata O. F. Müll. or the genus Pisidium was considerable. A rare relict Marstoniopsis scholtzi (Schm.) was sporadic.
Źródło:
Folia Malacologica; 1999, 07, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przestrzenne skutki procesu dezagraryzacji na obszarach wiejskich w Polsce
Spatial effects of the desagrarization process in the rural areas in Poland
Autorzy:
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/2031827.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
agricultural land
agriculture
desagrarization
Shift-Share Analysis (SSA)
Opis:
Desagrarization is an ambiguous, multifaceted notion and at the same time difficult to define. As a research subject it concerns mainly agriculture and is generally defined as the process of reducing the contribution of agriculture to the Gross Domestic Product. In terms of spatial changes caused by desagrarization, it is the reduction of agricultural land, increase in fallow land and woodiness, and uncontrolled landscape changes. The article seeks to present the spatial effects of the desagrarization process in the Polish rural areas. The results of the research were achieved by adopting the Shift-Share Analysis. The study confirmed that desagrarization manifests itself in changes both historical and global in character and the state interventionism and Common Agricultural Policy are limited to reducing in time its spatial and economic negative effects.
Źródło:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN; 2017, 267; 37-49
0079-3493
Pojawia się w:
Biuletyn Komitetu Przestrzennego Zagospodarowania Kraju PAN
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Technologia przygotowywania skażonej paszy granulowanej dla celów doświadczalnych
Technique of preparation of contaminated granulated food for experimental purposes
Autorzy:
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/874251.pdf
Data publikacji:
1977
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
doswiadczenia naukowe
pasze granulowane
technologia przygotowania
warunki laboratoryjne
zywienie zwierzat
pestycydy
Źródło:
Roczniki Państwowego Zakładu Higieny; 1977, 28, 4
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new record of Bithynia troschelii (Paasch, 1842) (Gastropoda: Bithyniidae) from two temporary ponds in Warsaw (Poland)
Autorzy:
Kolodziejczyk, A.
Lewandowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/83027.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2016, 24, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dreissena polymarpha (Pall.) on various species of macrophytes in the lake Hancza
Autorzy:
Binek, B.
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/83471.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2001, 09, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Long-term changes in the occurrence of unionid bivalves in a eutrophic lake
Autorzy:
Lewandowski, K.
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/83785.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
long-term change
occurrence
unionid bivalve
Unionidae
Unio tumidus
eutrophication
bivalve
lake
eutrophic lake
Lake Mikolajskie
Opis:
Earlier studies (1972–1987) on the occurrence of unionid bivalves in the eutrophicated Lake Mikołajskie (Masurian Lakeland, NE. Poland) were continued in 1992–2008. Of the five recorded species (Unio tumidus, U. pictorum, Anodonta cygnea, A. anatina, and Pseudanodonta complanata), A. cygnea and P. complanata disappeared by 1987, whereas U. pictorum was observed sporadically at that time, and the unionid occurrence zone was markedly reduced. Beginning in 1992, a pronounced increase in abundance of U. tumidus was observed, and since 2002–2003, a decline of the other two species. Since 2003 the maximal original vertical distribution of U. tumidus (down to ca. 5 m) was re-established. The size and age structure of its population changed markedly during the study. No individuals of shell length exceeding 55 mm and aged more than 5–6 years were recorded since 1987. Between 1972 and 1987 one-year-old individuals prevailed, whereas in the following years the age structure changed slowly, and in 2008 two- to four-year-old bivalves were most frequent. The potential effects of changes in trophy and the effects of other factors, e.g. decline of Dreissena polymorpha, on changes in the occurrence of Unionidae in Lake Mikołajskie are discussed.
Źródło:
Folia Malacologica; 2014, 22, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water bodies of a city park as habitats of rare, protected and alien species of molluscs
Autorzy:
Kolodziejczyk, A.
Lewandowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/83895.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2017, 25, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new record of an alien species, trumpet ram’s-horn, Menetus dilatatus (Gould, 1841) (Gastropoda: Planorbidae) in Poland
Autorzy:
Kolodziejczyk, A.
Lewandowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/83431.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
new record
alien species
snail
North American snail
ram's horn snail zob.North American snail
Menetus dilatatus
Gastropoda
Planorbidae
oxbow lake
Polska
Źródło:
Folia Malacologica; 2015, 23, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of Potamopyrgus antipodarum (Gray, 1843) in waters of the Wigry National Park (NE Poland) and the effect of selected habitat factors on its occurrence
Autorzy:
Brzezinski, T.
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/83961.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
The occurrence of the snail Potamopyrgus antipodarum (Gray) in the waters of the Wigry National Park was studied, and the factors, affecting its distribution and dispersal, were analysed in 1997 -1998. P. antipodarum was recorded from 7 out of the 24 examined water bodies of the Park and from the river Kamionka. The snail occurred in bottom deposits, on submerged and emerged macrophytes and in mats of filamentous algae in the lake Wigry, and clearly dominated in its malacofauna. In the remaining lakes, where it was present, it was not abundant. Active dispersal is not sufficient to explain the distribution of P. antipodarum in the lake Wigry. Its dispersal is probably a result of passive introduction by animals and humans, and to a lesser extent by water currents. An increased chlorophyll concentration in the pelagial has a positive effect on the occurrence of P. antipodarum. In much polluted habitats the vertical distribution and density of the species are limited. Significance of the trophy of water for the occurrence of P. antipodarum in the area is still unclear.
Źródło:
Folia Malacologica; 2001, 09, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The zebra mussel Dreissena polymorpha (Pallas, 1771) in the lake Hancza - vertical diversification of size and age structure
Autorzy:
Binek, B.
Kolodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/84314.pdf
Data publikacji:
2002
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2002, 10, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscs of selected water bodies in Warsaw
Autorzy:
Kolodziejczyk, A.
Dolega, A.E.
Powiązania:
https://bibliotekanauki.pl/articles/84144.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Malacofauna of lakes: Powsinkowskie, Wilanowskie and Czerniakowskie is composed of a similar number of taxa (14–16), but the species composition differs considerably. Mollusc densities are low, frequencies of individual species mostly do not exceed 25%, dominance structure, not very well marked in the deposits, is very clear among the few molluscs living on emerged macrophytes and macrophytes with floating leaves. Species diversity (Shannon-Weaver index) is higher in the bottom deposits, compared to macrophytes. Taxonomic composition of empty shells found in the bottom deposits, indicates that a few dozen year ago the malacofauna of the lakes was richer and similar between the lakes. It apears that the present composition of the malacofauna is affected, among others, by the character of the bottom deposits, transformations of littoral vegetation, level of pollution and trophy of the lakes; the influence of all these factors varies between species.
Źródło:
Folia Malacologica; 2004, 12, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania toksyczności kumulacyjnej bromfenwinfosu (IPO-62)
Investigations of cumulative toxicity of bromfenvinfos (IPO-62)
Autorzy:
Kolodziejczyk, A.
Kolodziejczyk, E.
Kolodziejczyk, L.
Powiązania:
https://bibliotekanauki.pl/articles/872742.pdf
Data publikacji:
1978
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
zwierzeta doswiadczalne
szczury
szczury Wistar
toksycznosc ostra
toksycznosc podostra
bromfenwinfos
pestycydy
oznaczanie
smiertelnosc
badania toksykologiczne
doswiadczenia na zwierzetach
Źródło:
Roczniki Państwowego Zakładu Higieny; 1978, 29, 6
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Constructing software for analysis of neuron, glial and endothelial cell numbers and density in histological Nissl-stained rodent brain tissue
Autorzy:
Kołodziejczyk, A.
Ładniak, M.
Piórkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/333525.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:
cell segmentation
cell-counting
image processing
image analysis
segmentacja komórki
zliczanie komórek
przetwarzanie obrazu
analiza obrazu
Opis:
Cell number, density and volume of white and gray matter in brain structures are not constant values. Cellular alterations in brain areas might coincide with neurological and psychiatric pathologies as well as with changes in brain functionality during selection experiments, pharmacological treatment or aging. Several softwares were created to facilitate quantitative analysis of brain tissues, however results obtained from these softwares require multiple manual settings making the computing process complex and time-consuming. This study attempts to establish half automated software for fast, ergonomic and an accurate analysis of cellular density, cell number and cellular surface in morphologically different brain areas: cerebral cortex, pond and cerebellum. Images of brain sections of bank voles stained with standard cresyl-violet technique (Nissl staining), were analyzed in designed software. Results were compared with other commercially available tools regarding number of steps to be done by user and number of parameters possible to measure.
Źródło:
Journal of Medical Informatics & Technologies; 2014, 23; 77-85
1642-6037
Pojawia się w:
Journal of Medical Informatics & Technologies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Resistive Superconducting Transition of a $(Tl_{0.6}Pb_{0.24}Bi_{0.16})(Ba_{0.1}Sr_{0.9})_2Ca_2Cu_3O_{y}$ Film
Autorzy:
Woch, W.
Chrobak, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1537158.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Uv
74.25.Sv
74.20.De
Opis:
In this paper we analyze the resistive transition as a function of both the temperature and the dc applied magnetic field. We use the two models: first, based on the Ambegaokar and Halperin theory that describes the resistive transitions by the modified Bessel function and second, based on the Anderson and Kim theory represented by the exponential formula. The fits of the models to experimental results show that the freezing into superconducting vortex-glass phase takes place at the same temperature that does not practically depend on the applied magnetic field.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 389-392
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic States of Collosal Magnetoresistive Manganites $La_{0.67}Pb_{0.33}Mn_{1-x}Fe_{x}O_{3}$ from Photoemission Spectroscopy
Autorzy:
Kowalik, M.
Zalecki, R.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538821.pdf
Data publikacji:
2010-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Lp
79.60.Bm
71.15.Ap
74.20.Mn
Opis:
The electron photoemission spectra of valence bands and core-level states of manganese perovskite $La_{0.67}Pb_{0.33}(Mn_{1-x}Fe_{x})O_{3}$ with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 were measured by the X-ray and Ultraviolet Photoemission Spectroscopy (XPS and UPS) below and above the metal-insulator transition. From analysis of the Mn 2p core-level spectra the ratio $Mn^{3+}//Mn^{4+}$ was calculated as a function of the iron content. Comparison of the valence band spectrum with band structure calculations and with the high-resolution spectra measured at synchrotron radiation for Ca-, Ba- and Ce- substituted manganites revealed the strong hybridisation of Mn 3d and of O 2p states between -3 eV and -7 eV, and no estimated oxygen states between 0 eV and -2 eV where the Mn-3d states play a predominant role. The composition dependent insulating energy gaps were measured at room temperature. Reasons for the behaviour were discussed taking into account previous analysis of XPS/UPS spectra of other manganese perovskites.
Źródło:
Acta Physica Polonica A; 2010, 117, 2; 277-280
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure of $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$
Autorzy:
Tokarz, W.
Kowalik, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1431533.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.55.Ak
72.80.Ga
75.47.lx
79.60.-i
Opis:
We present theoretical studies of electric and magnetic properties in manganese perovskite $La_{2//3}Pb_{1//3}Mn_{2//3}Fe_{1//3}O_3$. The calculations were carried out by means of the first-principles density functional theory (DFT) with general gradient approximation GGA+U using Wien2K package. The P-3c1 crystal structure was chosen from the detailed X-ray diffraction data for the perovskite. For Mn and Fe d electrons exact exchange energy was utilized. Different orientation of magnetic moments on Mn and Fe atoms was considered. The computed density of states display band gap for both spin orientations in accord with our previous work, indicating that this compound should show an insulating ground state
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 876-878
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscs of extremely artificial, small temporary water bodies in a city park
Autorzy:
Lewandowski, K.
Kolodziejczyk, A.
Spyra, A.
Powiązania:
https://bibliotekanauki.pl/articles/83193.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2018, 26, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structures of $La_{2/3}Pb_{1/3}Mn_{2/3}(Fe,Co,Ni)_{1/3}O_{3}$
Autorzy:
Kowalik, M.
Tokarz, W.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385092.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.55.Ak
72.80.Ga
75.47.Lx
79.60.-i
Opis:
We present calculations of the electronic band structures of $La_{2/3}Pb_{1/3}Mn_{2/3}(Fe,Co,Ni)_{1/3}O_{3}$ colossal magneto-resistance manganites. The calculations are based on first-principles density functional theory with general gradient approximation GGA+U using WIEN2k package. The calculations show that electronic structures of these compounds consist mainly of Mn 3d, O 2p, and (Fe,Co,Ni) 3d states, which are hybridized over whole valence bands. Substitution Mn ion by Fe, Co, or Ni ions reduces the Mn and O contributions to the valence bands and weakens the double exchange interaction. The results are in good agreement with available experimental data.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 251-253
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Izolacja i identyfikacja naturalnych substancji barwiących obecnych w próbkach farb artystycznych i tkaninach pochodzenia historycznego
Isolation and identification of natural dyestuffs present in artistic paints and textiles of historical origin
Autorzy:
Otłowska, O.
Śliwka-Kaszyńska, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/172392.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
barwniki
naturalne barwniki organiczne
analiza LC-DAD-MS
ekstrakcja
historyczne farby artystyczne
natural organic dyes
analysis LC-DAD-MS
extraction
historical artistic paints
Opis:
Natural organic dyes are group of substances that belong to various types of chemical compounds. The most commonly used in paintings and dyeing textiles were naturally occurring dyestuffs from group of anthraquinones, flavones and indigoid dyes. Identification of coloring substances present in historical artistic paints provides relevant information for a wide range of specialists dealing with works of art and in the field of conservation science. This research presents a review of analytical techniques (mainly chromatographic and spectroscopic) used for identification of dyes. It also describes the methods of colorants isolation from historical artistic paints and textiles. Furthermore, the article presents a brief characteristics of fragmentation reactions of selected groups of dyestuffs, which is useful in their identification.
Źródło:
Wiadomości Chemiczne; 2016, 70, 3-4; 163-187
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
O tzw. ontologicznym dowodzie istnienia Boga, przedstawionym przez św. Anzelma z Canterbury, uwag kilka
Some Remarks on the Ontological Proof for the Existence of God
Autorzy:
Kołodziejczyk, Leszek A.
Powiązania:
https://bibliotekanauki.pl/articles/965095.pdf
Data publikacji:
1998-09-01
Wydawca:
Uniwersytet Warszawski. Wydział Filozofii
Opis:
The article deals with the so-called ontological argument for the existence of God in the version originally presented by Saint Anselm of Canterbury in his Proslogion. Some quiestion concerning the interpretation of the argument are pondered over, and an attempt at formalizing the argument is made. It is suggested that at least some passages in the original formulation of the argument may be variantly interpreted. Nevertheless - it is concluded - none of the interpretative variants constitutes a decisive argument for the existence of God.
Źródło:
Filozofia Nauki; 1998, 6, 3-4; 133-145
1230-6894
2657-5868
Pojawia się w:
Filozofia Nauki
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Fluctuations of $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.9}Gd_{0.1})Cu_2O_{z}$ Bulk Superconductor
Autorzy:
Woch, W.
Chrobak, M.
Kołodziejczyk, A.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1426876.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.40.-n
74.20.De
74.25.Ha
Opis:
We report on the critical fluctuations from the magnetoresistance measurements in polycrystalline $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.9}Gd_{0.1})Cu_2O_{z}$ superconductor. The critical exponents have been calculated above the critical temperature $T_{c}$ as well as in the temperatures interval close to the zero resistance critical temperature. Above $T_{c}$ only Gaussian fluctuations have been observed in a three-dimensional fluctuating system. Additionally, far above $T_{c}$ the applied magnetic field induces the crossover from 3D to 2D fluctuating system. At the temperatures range close to the zero critical temperature the properties of the weak links are dominating and the fluctuating phase in each grain becomes long-range ordered as a consequence of the activation of weak links between grains.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1059-1062
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure and Photoemission States of $La_{2//3}Pb_{1//3}MnO_3$
Autorzy:
Tokarz, W.
Kowalik, M.
Zalecki, R.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1427488.pdf
Data publikacji:
2012-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.55.Ak
72.80.Ga
75.47.Lx
79.60.-i
Opis:
We present the theoretical study of electronic and magnetic properties in a manganese perovskite $La_{2//3}Pb_{1//3}MnO_3$. The calculations were carried out in frame of the first-principles density functional theory with the general gradient approximation using the WIEN 2K package. The P3c1 crystal structure was taken from the detailed X-ray diffraction data for the perovskite. The exact exchange energy was utilized for Mn d electrons. Density of states was determined by the modified tetrahedron method. As a result we get a valence band for the spin up and down density of states with the gap for the latter of 1.85 eV. We noticed that conduction band is mainly dominated by d spin up manganese electrons and $Mn (d_{xz}, d_{yz})$ states have twice larger contribution than $(d_{x^2 - y^2}, d_{xy})$. We attribute this to $Mn-O_6$ octahedral tilting. From the same reason $d_{3z^2 - r^2}$ state has no contribution to the density of states at the Fermi energy $(E_{F})$. Comparison of total density of states with the ultraviolet photoemission spectroscopy measurements shows similar features especially as far as the lead spectral intensity from the 6s electrons at about - 10 eV is concerned. The calculated total magnetic moment per formula unit is 3.66 $μ_{B}$, the measured one 3.48 $μ_{B}$/f.u.
Źródło:
Acta Physica Polonica A; 2012, 121, 5-6; 1151-1153
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistance and AC Susceptibility of YBCO 1:2:3 Films on Silver Substrates
Autorzy:
Zalecki, R.
Woch, W.
Chrobak, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1431494.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.F
74.25.Ha
74.25.Sv
Opis:
The $YBa_{2}Cu_{3}O_{δ}$ films were obtained directly on the polished silver substrates by the sedimentation process. Thickness of these films is of the order of several tens micrometers. The temperature dependences of the resistance and the AC susceptibility of the films were measured and analyzed. The critical temperatures of these specimens vary from 89 K to 91 K and they do not depend on the annealing temperatures. The critical currents were calculated from AC susceptibility measurements using the Bean's model.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 850-853
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetration Depth of Magnetic Field into YBa₂Cu₃Oₓ Film on Polycrystalline Ag Substrate
Autorzy:
Zalecki, R.
Woch, W.
Chrobak, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385218.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.Ha
74.25.Wx
74.20.De
Opis:
The magnetic field penetration depth into YBa₂Cu₃Oₓ film on polycrystalline Ag substrate with the critical temperature of 90.4 K was determined from the AC susceptibility measurements. The 95 μm thick YBCO film was deposited directly on Ag substrate by the sedimentation process. When the sample is in the Meissner state, the dispersive component of the AC susceptibility as well as its temperature dependence reflects the changes of the penetration depth with the temperature. The penetration depth of this film is found to be 5.4 μm.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 272-274
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Fluctuations of Bismuth Based 1G Tape
Autorzy:
Chrobak, M.
Woch, W.
Zalecki, R.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385435.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.78.-w
74.40.-n
74.62.-c
Opis:
The thermal fluctuations of bismuth based commercial 1G tape were studied near the critical temperature $T_{c}$=110.2 K. The detailed analysis of the temperature dependence of resistivity measurements was made in the temperature region from the zero resistance critical temperature up to 300 K. The thermal fluctuations of conductivity were analysed using the Aslamazov-Larkin microscopic approach and the critical exponents were calculated close to the transition temperature.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 306-308
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Resistive Superconducting Transition of Bulk $(Bi_{0.6}Pb_{0.4})_2Sr_2Ca_2Cu_{3}O_{x}$
Autorzy:
Woch, W.
Chrobak, M.
Zalecki, R.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1371417.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.F-
74.25.Uv
74.25.Wx
74.72.-h
64.60.F-
Opis:
The temperature widths of the resistive transition as well as the thermal fluctuations of bulk $(Bi_{0.6}Pb_{0.4})_2Sr_2Ca_2Cu_{3}O_{x}$ superconductor with $T_{c,50%}$ = 107.1 K were studied. The applied magnetic field widens the resistive transition according to the following formula: ΔT = $CH^{m} + ΔT_{0}$. The value of exponent m = 0.44 suggests that there is strong pining of vortices, especially at lower temperatures. The critical exponents λ of the conductivity were calculated using the following equation: Δσ = $Kε^{-λ}$, with the $λ_1$ = 1.75 close to the zero critical temperature and $λ_2$ = 3.77 at higher temperatures. These values were discussed within the available theoretical models.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 328-329
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature and Magnetic Field Dependences of Critical Current of Thallium-Based Superconducting Films
Autorzy:
Zalecki, R.
Kołodziejczyk, A.
Heiml, O.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2046810.pdf
Data publikacji:
2006-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Sv
74.78.Bz
74.72.Jt
Opis:
The critical current densities of three superconducting thallium-based films, prepared by screen printing, were measured as a function of temperature and applied magnetic field. The degradation of critical current densities was investigated for two different magnetic field orientations with respect to the sample plane - parallel and perpendicular.
Źródło:
Acta Physica Polonica A; 2006, 109, 4-5; 669-674
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AC Susceptibility of YBCO 1:2:3 Films on Silver Substrates
Autorzy:
Zalecki, R.
Woch, W.
Chrobak, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1374144.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.F-
74.25.Ha
74.25.Sv
Opis:
The $YBa_2Cu_3O_δ$ films were obtained directly on silver substrates by the sedimentation processes. The thicknesses of these films are of the order of several tens μ. The temperature dependences of the AC susceptibility of the films were measured and analyzed. The critical temperatures of these specimens obtained from the dispersion part of AC susceptibility vary from 89.2 K to 92.5 K. The critical currents were calculated from the absorption part of AC susceptibility using the Bean model. The temperature dependences of the critical currents were fitted using the Ginzburg-Landau strong coupling limit approach.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-13-A-15
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Currents of Bismuth 1G Tape
Autorzy:
Woch, W.
Zalecki, R.
Chrobak, M.
Kołodziejczyk, A.
Powiązania:
https://bibliotekanauki.pl/articles/1385464.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.F-
74.25.Ha
74.25.Sv
Opis:
The critical currents of commercial bismuth based superconducting tape were determined in the two ways. In the first one the transport critical current density was measured by the four points method using the dc current power supply at the liquid nitrogen temperature. In the second one the critical current densities were obtained from the absorption part of ac susceptibility measurements using the Bean model near the critical temperature. The temperature dependence of the critical current densities was fitted to take advantage of the Ginzburg-Landau strong-coupling limit approach. Using the fit parameters the critical current density at 77 K was calculated. The critical temperature of this tape ($T_{c}$= 110.5 K) was determined from the ac susceptibility measurements.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 315-317
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Electronic States of Thallium- and Bismuth-Based Superconductors
Autorzy:
Zalecki, R.
Kołodziejczyk, A.
König, J. W.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2014372.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
79.60.-i
Opis:
X-ray photoemission spectra the core-levels as well as the X-ray photoemission spectra and ultraviolet photoemission spectra from the valence bands of the (Tl$\text{}_{0.6}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$) Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{y}$ and (Bi$\text{}_{1.75}$Pb$\text{}_{0.35}$)Sr$\text{}_{1.9}$Ca$\text{}_{2.05}$Cu$\text{}_{3.05}$O$\text{}_{y}$ superconductors were measured and analyzed. Special attention was paid to the valence band X-ray photoemission spectra and ultraviolet photoemission spectra, the Cu 2p core-level X-ray photoemission spectra and the Cu L$\text{}_{2,3}$-M$\text{}_{4,5}$M$\text{}_{4,5}$ and O K-L$\text{}_{2,3}$L$\text{}_{2,3}$ Auger spectra. Both Cu 2p$\text{}_{3}\text{}_{/}\text{}_{2}$ and Cu 2p$\text{}_{1}\text{}_{/}\text{}_{2}$ core-level lines consisted of two spin-orbit split main lines accompanied with the two satellite lines. The charge transfer energy Δ from the oxygen ligand to the copper 3d$\text{}^{9}$ states and the hopping integral t were estimated from the energy separation between the main line and the satellite line taking advantage of the local cluster model calculations and their extension to high-temperature superconductors. The Coulomb correlation on-site energy U$\text{}_{dd}$ of two electrons in the same copper orbital and U$\text{}_{pp}$ of two electrons in the oxygen orbital as well as the correlation energy U$\text{}_{cd}$ of the 2p core hole - 3d electron interaction have been estimated from the Auger electron spectra and the valence band spectra. They are: U$\text{}_{dd}$=6.0±0.5eV, of U$\text{}_{pp}$≅ 10±1eV and of U$\text{}_{cd}$≅ 8.0±0.5eV nearly the same for both the Tl- and Bi-compounds. We conclude that these compounds are the charge transfer strongly-correlated metals.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 513-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specific Heat and Magnetoresistance of Y-, Tl- and Bi-Type High-Temperature Superconductors
Autorzy:
Zalecki, R.
Kozłowski, A.
Kołodziejczyk, A.
Gritzner, G.
Mair, M.
Powiązania:
https://bibliotekanauki.pl/articles/1955838.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Fq
74.25.Ha
74.72.Bk
74.72.Hs
74.25.Bt
Opis:
Specific heat of polycrystalline DyBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7}$ and Tl$\text{}_{0.58}$Pb $\text{}_{0.42}$Sr$\text{}_{1.6}$Ba$\text{}_{0.4}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{9}$ samples, as well as the single crystal of Bi$\text{}_{2}$Sr$\text{}_{2}$CaCu$\text{}_{2}$O$\text{}_{8}$ have been measured within the temperature interval from 50 to 250 K. For Dy- and Tl-specimens the pronounced jump in specific heat and apparent contribution from Gaussian fluctuations of superconducting order parameter close to T$\text{}_{c}$ have been observed. In contrary, for Bi-specimen only a rounded maximum within a broad interval around T$\text{}_{c}$ has been detected. Magnetoresistance measurements as a function of temperature just below T$\text{}_{c}$ have been carried out for Dy- and Tl-samples and the slopes of upper critical fields have been determined. The data have been analysed within a frame of Ginzburg-Landau-Abrikosov- Gorkov theory with additional Gaussian-like fluctuation term. The electronic specific heat coefficients γ, and the coherence length χ have been obtained.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 431-434
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of Resistive Superconducting Transition of Thallium Based Superconductors
Autorzy:
Woch, W.
Zalecki, R.
Chrobak, M.
Kołodziejczyk, A.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1431253.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.40.n
74.20.De
74.25.Ha
Opis:
A width and shape of resistive transition as well as thermal fluctuations of the thallium based superconductors were analyzed theoretically. The applied magnetic field widens the resistive transition according to the following formula: $ΔT=CH^{m}+ΔT_{0}$. The exponent m fluctuates around 2/3 and depends on vortex structure and strength of the pinning force. The shape of the resistive transition was fitted by two models: the first one based on Ambegaokar-Halperin theory and the other one based on Anderson-Kim theory expressed by the exponential formula. Critical fluctuations were analyzed on the basis of magnetoresistance measurements results. The critical exponents have been calculated above the critical temperature $T_{c}$ as well as for temperatures close to the zero resistance critical temperature.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 789-795
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Penetration Depth of $Tl_2Ba_2Ca_2Cu_3O_y$ and $Tl_{0.58}Pb_{0.4}Sr_{1.6}Ba_{0.4}Ca_2Cu_3O_y$ Bulk Superconductors
Autorzy:
Zalecki, R.
Woch, W.
Kołodziejczyk, A.
Konig, W.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1374160.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.Ha
74.25.Wx
74.20.De
Opis:
The penetration depths of bulk $Tl_2Ba_2Ca_2Cu_3O_y$ and $Tl_{0.58}Pb_{0.4}Sr_{1.6}Ba_{0.4}Ca_2Cu_3O_y$ superconductors with the critical temperatures 112 K and 114 K, respectively, were determined from the AC susceptibility measurements. When the samples are in the Meissner state, the dispersive components of AC susceptibility as well as their temperature dependences reflect the changes of the penetration depths at various temperatures. In these bulk ceramic superconductors the penetration depths are of the order of few μm and they are comparable to the grains sizes in the ceramics.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-133-A-136
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Inter- and Intragrain Magnetization of Thallium-Based Superconductors
Autorzy:
Tokarz, W.
Kąkol, Z.
Kołodziejczyk, A.
König, W.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2014492.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Fq
74.72.-h
74.50.+r
Opis:
We report on magnetization and magnetic hysteresis measurements for the (Tl$\text{}_{0.6}$Bi$\text{}_{0.5}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{y}$ Ag-sheathed superconducting tape as well as for the powdered and bulk (Tl$\text{}_{0.6}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{y}$ superconductors. For the investigated tape and bulk specimens the low field magnetization showed a deviation from the ideal linear M(H) dependence, which was attributed to the superposition of inter- and intragrain superconducting currents. Fitting of the theoretical magnetization curves to the experimental data allowed for the independent determination of the intragrain critical current densities for the superconducting grains and intergrain critical current densities for the weak link system at 77K.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 633-636
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superconductivity, Weak Itinerant Ferromagnetism and Electronic Band Structure of Y$\text{}_{9}$Co$\text{}_{7}$
Autorzy:
Kołodziejczyk, A.
Wiendlocha, B.
Zalecki, R.
Toboła, J.
Kaprzyk, S.
Powiązania:
https://bibliotekanauki.pl/articles/2047310.pdf
Data publikacji:
2007-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Jb
74.25.Ha
74.20.Mn
Opis:
The paper presents experimental results for the intermetallic compound Y$\text{}_{9}$Co$\text{}_{7}$ which is the first very weak itinerant ferromagnetic superconductor. The measurements of electrical resistivity, susceptibility, magnetization, specific heat, nuclear magnetic resonance, and other properties show the magnetic transition at T$\text{}_{C}$≈ 4.5 K and the onset of superconductivity at about T$\text{}_{S}$≈ 2.5 K, revealing the coexistence state within a temperature interval below T$\text{}_{S}$. A few of the results are shortly reviewed and discussed. We focus attention on our recent ultraviolet photoemission spectroscopy and their comparison with our band structure calculations. Interpretations are considered which take into account the characteristic structure of the compound and different possible types of magnetic ordering.
Źródło:
Acta Physica Polonica A; 2007, 111, 4; 513-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bismuth Valence in a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_{2}O_{y}$ Superconductor from X-Ray Photoemission Spectroscopy
Autorzy:
Zalecki, R.
Woch, W.
Kowalik, M.
Kołodziejczyk, A.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1537186.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.25.Jb
79.60.-i
Opis:
The X-ray electron photoemission spectra of a $Tl_{0.7}Bi_{0.3}Sr_{1.6}Ba_{0.4}CaCu_2O_{y}$ superconductor were measured with $Al K_{α}$ and $Mg K_{α}$ radiation at room temperature. The Bi 4f spectrum was compared to the same spectra of $Bi_{1.75}Pb_{0.35}Sr_{1.9}Ca_{2.05}Cu_{3.05}O_{y}$ and $Tl_{0.6}Pb_{0.4}Sr_{1.6}Ba_{0.4}Ca_2Cu_3O_{y}$ superconductors. In Bi,Pb-based superconductor only one type of $Bi^{3+}$ ions is present. The Bi 4f spectrum in the Tl,Bi-superconductor consists of two contributions due to the different valences. The component from $Bi^{5+}$ lines is in higher binding energy than from $Bi^{3+}$. The ratio of trivalent $Bi^{3+}$ to pentavalent $Bi^{5+}$ bismuth ions was calculated from decomposition of the spin-orbit split spectrum of the Bi 4f photoelectrons. The conclusion is that Bi is present in trivalent and in pentavalent form and the ratio of $Bi^{3+}$ to $Bi^{5+}$ is 1.87 ± 0.02.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 393-395
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Irreversibility Fields of (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$) (Sr$\text{}_{0.85}$Ba$\text{}_{0.15}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{z}$ Film on Polished Silver Substrate
Autorzy:
Woch, W. M.
Zalecki, R.
Kołodziejczyk, A.
Deinhofer, C.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2047336.pdf
Data publikacji:
2007-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.25.Sv
74.78.Bz
74.62.Yb
Opis:
Superconducting (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.85}$Ba$\text{}_{0.15}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{z}$ film was prepared on a highly polished, untextured silver substrate. A superconducting transition temperature (T$\text{}_{c,50%}$) of 114.7±0.3 K was obtained from the resistance versus temperature measurements for different applied ac currents. The density of the critical current measured by transport method was found to be 11.4×10$\text{}^{3}$ A/cm$\text{}^{2}$ at 77 K in the self field. This value is smaller than the value calculated from ac susceptibility data: 53×10$\text{}^{3}$ A/cm$\text{}^{2}$ at 77 K. The magnetical broadening of the resistivity transition to the superconducting state was observed. The irreversibility fields of the thallium based film were obtained from magnetoresistive measurements for both parallel to the c-axis and parallel to the $ab$ plane showing the anisotropy according to the magnetic field direction. The irreversibility fields as a function of temperature were successfully fitted by the power law.
Źródło:
Acta Physica Polonica A; 2007, 111, 5; 737-743
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photoemission Electronic States of (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$
Autorzy:
Penc, B.
Zalecki, R.
Jezierski, A.
Szytuła, A.
Kołodziejczyk, A.
Ivanov, V.
Powiązania:
https://bibliotekanauki.pl/articles/2043378.pdf
Data publikacji:
2005-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.-i
71.20.Gj
71.15.Ap
Opis:
The core-level and valence band electronic states studies of single crystalline transition metal silicides (Mn$\text{}_{1-x}$Fe$\text{}_{x}$)$\text{}_{5}$Si$\text{}_{3}$ (x=0 and 0.05) by the X-ray and ultraviolet photoemission spectroscopies are reported. The Mn 2p core-level spectra for both compounds were ascribed to the relevant Mn sites in their crystal structure. The valence band spectra were compared with the result of ab-initio band calculations using the tight-binding linear muffin-tin orbital method. It was concluded that the enhancement of the spectral density within the 2 eV binding energy region below the Fermi energy comes from the effect of strongly correlated Mn 3d electrons.
Źródło:
Acta Physica Polonica A; 2005, 107, 6; 967-976
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Critical Currents, Magnetization and Microwave Absorption of $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{0.8}Gd_{0.2})Cu_2O_{z}$ Superconductor
Autorzy:
Woch, W.
Niewolski, J.
Tokarz, W.
Kołodziejczyk, A.
Sudra, H.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1536936.pdf
Data publikacji:
2010-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.81.Bd
74.25.Sv
74.81.Fa
Opis:
The bulk ($Tl_{0.5}Pb_{0.5})Sr_2(Ca_{1 - x}Gd_{x})Cu_2O_{z}$ superconductors with x = 0.1, 0.2 and 0.3 have unique and very interesting magnetic and electrical properties. In this paper we focused our attention on the superconductor with gadolinium content x = 0.2. We measured the magnetic field dependences of the transport critical currents, the microwave absorption as well as the magnetization for different temperatures. The critical temperature of this sample is $T_c$ = 105.3 ± 0.2 K and the transition width Δ $T_{90% - 10%}$ = 3.6 ± 0.2 K. The critical current of this superconductor is $J_c$ = 1 820 ± 10 A/$cm^2$ at 77 K. The data were analyzed within the frame of the Bean and Kim models as well as the percolation model.
Źródło:
Acta Physica Polonica A; 2010, 118, 2; 319-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Band Structure and Photoemission States of $Bi_{1.96}Mg_{0.04}Se_3$
Autorzy:
Tokarz, W.
Zalecki, R.
Kowalik, M.
Kołodziejczyk, A.
Kozłowski, A.
Miotkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/1374118.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.-b
71.55.Ak
72.80.Ga
75.47.Lx
79.60.-i
Opis:
We present theoretical band structure calculations and ultraviolet electron photoemission spectroscopy of a topological insulator $Bi_{1.96}Mg_{0.04}Se_3$. Our calculations were based on the first-principles density functional theory with general gradient approximation using Wien2k package with the spin-orbit interaction included by a second-variation method. The R3̅m crystal structure was optimized. In consequence, 4% decrease of volume and 3% decrease of ratio c/a was obtained. This modified structure was multiplied three times in a and b direction in order to place proper amount of Mg. Final crystal structure P3m1 with 135 atoms was used for the calculations. As a result metallic band structure was obtained with conduction band extended from -5.6 eV up to 0.16 eV. It composes mostly from Se p states. Comparison of total DOS with ultraviolet photoemission spectrum shows similar features.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-127-A-129
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kim-Type Critical State Models and Critical Currents of Thallium Based Superconductors
Autorzy:
Woch, W.
Zalecki, R.
Kołodziejczyk, A.
Heiml, O.
Sudra, H.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/1812280.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.Jt
74.25.Sv
74.25.Ha
Opis:
The two extended formulae in the power form of the Kim critical state model were used to fit the critical currents versus the dc applied magnetic field. Two samples of thallium based superconductors: the $(Tl_{0.6}Pb_{0.24}Bi_{0.16})$$(Sr_{0.9}Ba_{0.1})_2Ca_2Cu_3O_y$ film on single-crystalline lanthanum aluminate and the bulk $(Tl_{0.5}Pb_{0.5})Sr_2(Ca_{1.8}Gd_{0.2})Cu_2O_y$ were chosen to test the models. The formulae were compared to the percolation model described by the exponential expression. The first model fits the experimental data better for the thallium based film whereas the second approach is better for the thallium based bulk sample.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 99-106
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Magnetic Field on Resistive Transition of Thin Film Thallium Based Superconductors
Autorzy:
Woch, W. M.
Zalecki, R.
Kołodziejczyk, A.
Chmist, J.
Heiml, O.
Gritzner, G.
Powiązania:
https://bibliotekanauki.pl/articles/2041534.pdf
Data publikacji:
2004-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.78.Bz
74.25.Qt
74.62.Yb
Opis:
The temperature and magnetic field dependences of a.c. resistance of c-axis oriented (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.8}$Ba$\text{}_{0.2}$)$\text{}_{2}$Ca $\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{x}$ and (Tl$\text{}_{0.6}$Pb$\text{}_{0.24}$Bi$\text{}_{0.16}$)(Sr$\text{}_{0.9}$Ba$\text{}_{0.1}$)$\text{}_{2}$Ca$\text{}_{2}$Cu$\text{}_{3}$ O$\text{}_{x}$ thin films as well as of (Tl$\text{}_{0.5}$Pb$\text{}_{0.5}$)(Sr$\text{}_{0.8}$Ba$\text{}_{0.2}$)$\text{}_{2}$Ca$\text{}_{ }$2Cu$\text{}_{3}$O$\text{}_{x}$ bulk sample from 77 K to room temperature and in magnetic fields from zero to 3000 Oe were measured and analyzed. The magnetic field and temperature dependence of the resistive superconducting transition and irreversibility field were discussed both in the flux-creep model and in the superconducting liquid vortex state model. The temperature width of resistive transition was explained taking advantage of the Ambegaokar and Halperin model of the resistance of superconducting Josephson weak links and barrier of vortex motion presented by Tinkham. The irreversibility field was described by an exponential formula.
Źródło:
Acta Physica Polonica A; 2004, 106, 5; 785-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Fluctuations in YBCO Thin Film on MgO Substrate
Autorzy:
Chrobak, M.
Woch, W.
Szwachta, G.
Zalecki, R.
Gondek, Ł.
Kołodziejczyk, A.
Kusiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/1374789.pdf
Data publikacji:
2014-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.72.-h
74.78.-w
74.40.-n
74.62.-c
Opis:
The c-axis orientation $YBa_2Cu_3O_δ$ thin film was prepared directly on MgO substrate by the pulse laser deposition. The thickness of the film was 170 nm. The superconducting critical temperature was $T_{c50%}$=89 K and the width of superconducting transition was Δ T= 1.6 K. Temperature dependence of the critical current of the film was obtained from the temperature dependences of the imaginary part of the AC susceptibility using the Bean model. The critical current density was $J_{c}$=1.2×$10^7$ A/$cm^{2}$ at 77 K in the self field. The critical exponents were calculated for several values of the DC applied magnetic field using the temperature dependences of magnetoresistivity. The thermal fluctuations in vicinity of the critical temperature were analysed.
Źródło:
Acta Physica Polonica A; 2014, 126, 4a; A-88-A-91
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetization, Susceptibility and Critical Currents of $(Tl_{2-x}Re_{x})Ba_{2}CaCu_{2}O_{y}$ Thin Films
Autorzy:
Woch, W.
Dujavová, A.
Przewoźnik, J.
Zalecki, R.
Kołodziejczyk, A.
Sojková, M.
Chromik, Š.
Powiązania:
https://bibliotekanauki.pl/articles/1431480.pdf
Data publikacji:
2012-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
70.72.Gr
74.25.Ha
Opis:
The magnetization and the AC susceptibility vs. the temperature as well as the applied magnetic field of the thin film $(Tl_{2-x}Re_{x})Ba_{2}CaCu_{2}O_{y}$ with x=0 and 0.15 on R-plane sapphire substrate with $CeO_{2}$ buffer layer were measured and analyzed. XRD measurements show c-axis as well as a-b plane oriented Tl-1212 and superconducting pure phase. The zero critical temperature of the Tl-Re sample is 99.9 K and is practically the same as the critical temperature of the rhenium free sample: 99.5 K. The Tl-Re superconductor exhibits two peaks of the absorption part of AC susceptibility in the vicinity of the critical temperature in contrary to the rhenium free sample. The first peak placed in higher temperature is related to intragranular properties while the second peak is connected with the intergranular one. The critical current densities versus temperature were calculated from AC susceptibility as well as from the magnetization loops measurements using the Bean's critical state model. The Tl-Re film exhibits the higher critical current in comparison to the rhenium free thallium based film.
Źródło:
Acta Physica Polonica A; 2012, 121, 4; 845-849
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-50 z 113

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