Autor: (St). - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of Coulomb Interactions on the Properties of Induced Pairing Model
Autorzy:: Czart, W. R.
Robaszkiewicz, St.
Powiązania:: https://bibliotekanauki.pl/articles/2027440.pdf
Data publikacji:: 2001-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 74.20.-z
74.20.Mn
71.28.+d
74.25.Ha
Opis:: We study the superconducting properties of a model of coexisting itinerant carriers and local pairs with finite binding energy, taking into account the effects of Coulomb (density-density) and direct pair hopping interactions. The evolution of the phase diagrams and superfluid characteristics with electron concentration, interaction parameters and the relative position of the bands is examined. The model is found to exhibit several kinds of superconducting behaviors ranging from the BCS-like to the local-pair-like. The relevance of the obtained results to the interpretation of experimental data for the doped bismuthates (Ba$\text{}_{1-x}$K$\text{}_{x}$BiO$\text{}_{3}$ and BaPb$\text{}_{1-x}$BiO$\text{}_{3}$) is pointed out.
Źródło:: Acta Physica Polonica A; 2001, 100, 1; 75-88
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Investigation, of Solid-Liquid Phase Transition for Sn-54wt%In Alloy by Positron Anihilation Spectroscopy
Autorzy:: Chabik, St.
Szuszkiewicz, M.
Rudzińska, W.
Powiązania:: https://bibliotekanauki.pl/articles/1933481.pdf
Data publikacji:: 1995-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.72.Cc
78.70.Bj
64.70.Dv
Opis:: The peak coincidence counting rate F(T) was measured for Sn-54wt%In alloy at the temperature range from room temperature to 400°C. It was observed that for both heating and cooling run, F(Τ) parameter changes in the liquid phase. These changes were related to disintegration of SnII microcrystals. From a simple trapping model the defect disintegration enthalpy, H$\text{}_{1}$, was calculated. For heating and cooling run, the value of H$\text{}_{1}$ was 0.53 ± 0.03 eV and 0.67 ± 0.07 eV, respectively. For well-annealed and cold rolled samples we find only one component, equal 200 ps, in the lifetime spectrum.
Źródło:: Acta Physica Polonica A; 1995, 88, 1; 97-101
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Study of Defects in GeTe and (GeTe)$\text{}_{1-x}$(AgBiTe_2)_x Solid Solutions by Positrons
Autorzy:: Misheva, M.
Avramova, I.
Plachkova, St.
Djourelov, N.
Powiązania:: https://bibliotekanauki.pl/articles/2025145.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.70.Bj
Opis:: Positron lifetimes and Doppler broadening of the annihilation line measurements were performed to study the vacancy type defects in polycrystalline GeTe and (GeTe)$\text{}_{(1-x)}$(AgBiTe$\text{}_{2}$)$\text{}_{x}$ (x=0,0.03,0.05,0.1,0.15,0.2, and 1) solid solutions. The values of lifetimes obtained are explained as due to positron and positronium saturated trapping at vacancies and vacancy clusters. The interdependence between mean positron lifetime and hole concentration is discussed.
Źródło:: Acta Physica Polonica A; 2001, 99, 3-4; 423-428
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Positron Annihilation in Solid and Liquid Bi$\text{}_{40}$Sn$\text{}_{60}$ Alloy
Autorzy:: Chabik, St.
Rudzińska, W.
Szuszkiewicz, M.
Szymański, Cz.
Powiązania:: https://bibliotekanauki.pl/articles/2007925.pdf
Data publikacji:: 1999-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.70.Dv
61.72.Cc
78.70.Bj
Opis:: The peak counting rate, F(T), for Bi$\text{}_{40}$Sn$\text{}_{60}$ alloy in the temperature range from room temperature to 400°C was measured in three consecutive heating-cooling runs. Significant changes in F(T) were observed in the temperature interval between the solidus and liquidus temperature. The magnitude of these anomalies systematically diminishes in consecutive heating-cooling runs. Noticeable changes of values of F(T) parameter in the liquid alloy were observed, too. These effects were connected with trapping of positrons at the grain boundaries-defects and in the short-range ordered regions in the liquid alloy. Also microscopic structure of sample before and after measurements cycles was observed.
Źródło:: Acta Physica Polonica A; 1999, 95, 4; 479-482
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: X-Ray Photoemission Spectra of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ Systems
Autorzy:: Szajek, A.
Jezierski, A.
Kowalczyk, A.
Baszyński, J.
Bartkowski, St.
Neumann, M.
Borstel, G.
Powiązania:: https://bibliotekanauki.pl/articles/1955840.pdf
Data publikacji:: 1997-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 71.20.Eh
71.20.-b
79.60.-i
Opis:: The electronic structure of Dy(Co$\text{}_{1-x}$Al$\text{}_{x}$)$\text{}_{2}$ compounds (Laves phase - MgCu$\text{}_{2}$, C15) for Al concentrations x = 0.0, 0.1, 0.2 was investigated by X-ray photoelectron spectroscopy. The results were compared with the ab initio band structure calculations.
Źródło:: Acta Physica Polonica A; 1997, 91, 2; 439-442
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 6.

Tytuł:: Experimental Investigation of Few-Nucleon Dynamics at Medium Energies
Autorzy:: Khatri, G.
Bodek, K.
Ciepał, I.
Kalantar-Nayestanaki, N.
Kistryn, St.
Kłos, B.
Kozela, A.
Magiera, A.
Mazumdar, I.
Messchendorp, J.
Parol, W.
Rozpędzik, D.
Skwira-Chalot, I.
Stephan, E.
Wrońska, A.
Zejma, J.
Powiązania:: https://bibliotekanauki.pl/articles/1402633.pdf
Data publikacji:: 2015-05
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 21.30.-x
24.70.+s
25.10,+s
13.75.Cs
Opis:: An experiment, with unpolarized deuteron beam of 160 MeV impinging on liquid hydrogen and liquid deuterium targets, was carried out using BINA detector at KVI, in Groningen, the Netherlands. Data were collected for the purpose of obtaining high precision differential cross-section for the deuteron break-up reaction. The elastic scattering data were also collected alongside. We present here the methods applied in analysis of data collected in the backward part of the detector.
Źródło:: Acta Physica Polonica A; 2015, 127, 5; 1529-1530
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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