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    Wyświetlanie 1-9 z 9
    Tytuł:
    Reappearance of Antiferromagnetic Order in $Nd_{0.9}Ca_{0.1}BaCo_{2}O_{5+δ}$ for δ > 0.51
    Autorzy:
    Piętosa, J.
    Kolesnik, S.
    Puźniak, R.
    Dabrowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1374353.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.Kz
    75.50.Gg
    62.50.-p
    Opis:
    The absence of the antiferromagnetic order in $Nd_{0.9}Ca_{0.1}BaCo_2O_{5.5}$ has been found to remain unchanged by applying a hydrostatic pressure of 10 kbar. In magnetic studies of polycrystalline $Nd_{0.9}Ca_{0.1}BaCo_2O_{5+δ}$ (δ=0.07-0.69), we have found a reappearance of the antiferromagnetic phase, caused by an increase in oxygen index δ above 0.51 related to extra oxygen ions addition into the $NdO_{δ}$ plane. For the samples with δ=0.555 and 0.59, a coexistence of well developed antiferromagnetic phase with ferrimagnetic one is evidenced.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4a; A-50-A-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design Rules for Manganites with Novel Magnetic and Electronic Properties
    Autorzy:
    Dabrowski, B.
    Chmaissem, O.
    Mais, J.
    Kolesnik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037095.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.12.-q
    75.50.-y
    Opis:
    We have been systematically developing strategies for making new perovskite manganites with novel magnetic and electronic properties. This effort requires a two-fold approach: understanding the dependence of properties on chemical and structural factors and development of the ability to synthesize desired compounds. We show that, similar to other single valent 3d systems, the magnetic superexchange interactions in AMnO$\text{}_{3}$ manganites (A = rare or alkaline earth's) are dependent on the Mn-O-Mn bond angle which is a function of interatomic distances A-O and Mn-O. The local structural disorder on the A-site suppresses magnetic interactions. Recently, by comparing disordered (randomly mixed La/Ba) and ordered (forming Ba/La/Ba layers along the c-axes) perovskites we have demonstrated much more conspicuous effects of structural and charge disorder for mixed-valent manganites. We show that by stabilizing the ordered structure; i.e., by suppressing local structural and charge disorder on the A-site, a substantial increase in T$\text{}_{C}$ from 340 to 365~K can be achieved. A similar control of order on the Mn-site was achieved for SrMn$\text{}_{1-y}$Ga$\text{}_{y}$ O$\text{}_{3-\text{}_{y}\text{}_{/}\text{}_{2}$ compounds near y=0.5, while SrMn$\text{}_{1-y}$Fe$\text{}_{y}$O$\text{}_{3}$ compounds are always randomly mixed. To achieve these compounds, we have been systematically developing special synthesis techniques for extending chemical composition ranges far beyond those previously achieved, developing rules for predicting which compositions should be possible to produce by these special techniques, and establishing methods for selectively ordering or disordering mixtures of metal atoms on the A- or Mn-sites.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 45-56
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Photomemory Effect in Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$:In for Direct Measurements of Magnetization of Bound Magnetic Polarons
    Autorzy:
    Wojtowicz, T.
    Koleśnik, S.
    Miotkowski, I.
    Furdyna, J. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1921550.pdf
    Data publikacji:
    1992-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.38.+i
    75.50.Pp
    Opis:
    The first direct measurement of the magnetization of donor bound magnetic polarons in diluted magnetic semiconductors is reported. The experiment has been performed taking advantage of photomemory effect found in n-type Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te$\text{}_{1-y}$Se$\text{}_{y}$ crystals doped with In. Good agreement between experimental results and theory of bound magnetic polarons is observed.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 4; 637-640
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel Properties of Atomically Arranged Perovskites
    Autorzy:
    Dabrowski, B.
    Kolesnik, S.
    Chmaissem, O.
    Suescun, L.
    Mais, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047207.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.47.Lx
    75.47.Gk
    61.12.Ld
    Opis:
    Perovskites AMO$\text{}_{3-δ}$ attain unique electronic, magnetic, ferroelectric, thermoelectric, mixed-conducting, and other functional properties through selection of the A- and M-site ions, their fractions, ionic sizes and valences, spin states, and orbital orderings, as well as the oxygen content and vacancy ordering. We illustrate here our systematic exploration of the effects of composition, temperature, pressure, and oxygen content on the thermodynamic stability and magnetic properties for La$\text{}_{1-x-y}$Sr$\text{}_{x}$Ba$\text{}_{y}$MnO$\text{}_{3}$ manganites. Parameters controlling magnetic transitions are identified through examples of single-valent compounds of RMnO$\text{}_{3}$ (the Mn-O-Mn bond angles that can be equivalently described in terms of the tolerance factor) and Sr$\text{}_{1-x}$Ca$\text{}_{x}$MnO$\text{}_{3}$ (the tolerance factor and disorder described in terms of the variance of A-site ion sizes), and the mixed-valent La$\text{}_{0.5}$Sr$\text{}_{0.5-y}$Ba$\text{}_{y}$MnO$\text{}_{3}$ (the tolerance factor, variance of sizes, and the local strains described in terms of the elongated Mn-O bonds). By using an example of kinetically stable, atomically-ordered layered-perovskites we show that improved useful properties, such as the increase in the Curie temperature T$\text{}_{C}$ and enhancement of colossal magneto-resistive effect at room temperature, can be achieved through decreases in structural distortions such as variance of sizes and local strains.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 15-25
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Pressure on Magnetic Properties of La$\text{}_{1-x}$ Sr$\text{}_{x}$CoO$\text{}_{3-δ}$(x=0.5, 0.67, 1)
    Autorzy:
    Piętosa, J.
    Wiśniewski, A.
    Puźniak, R.
    Kolesnik, S.
    Majjiga, M.
    Dabrowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046737.pdf
    Data publikacji:
    2006-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.47.Gk
    75.30.Kz
    Opis:
    Influence of pressure on the phase transition temperature T$\text{}_{C}$ and on the spontaneous magnetisation M$\text{}_{0}$ of highly Sr substituted and oxygen nonstoichiometric La$\text{}_{1-x}$Sr$\text{}_{x}$CoO$\text{}_{3-δ}$ samples was investigated. An increase in T$\text{}_{C}$ and M$\text{}_{0}$ with pressure in investigated samples was found, indicating strengthening of ferromagnetic double exchange interactions, and the expansion of volume of ferromagnetic phase as a~result of enhancement in ferromagnetic interactions in both cluster-glass and long range ferromagnetic states. We did not observe clear correlation between changes in pressure coefficient dT$\text{}_{C}$/dP and changes in the formal oxidation state of the Co ion.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 4-5; 527-532
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Hydrostatic Pressure on Magnetic Properties of (Sr,La)(Ru,Cr,Mn)O$\text{}_{3}$
    Autorzy:
    Piętosa, J.
    Wiśniewski, A.
    Puźniak, R.
    Kolesnik, S.
    Majjiga, M.
    Dabrowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047244.pdf
    Data publikacji:
    2007-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.30.-m
    75.30.Kz
    Opis:
    An influence of hydrostatic pressure, P, on phase transition temperature, T$\text{}_{C}$, and spontaneous magnetisation, M$\text{}_{0}$, of selected perovskite ruthenates (SrRuO$\text{}_{3}$, La$\text{}_{0.2}$Sr$\text{}_{0.8}$RuO$\text{}_{3}$, SrRu$\text{}_{0.9}$Mn$\text{}_{0.1}$O$\text{}_{3}$, and SrRu$\text{}_{0.9}$Cr$\text{}_{0.1}$O$\text{}_{3}$) was determined to 12 kbar. A decrease in T$\text{}_{C}$ with pressure was found for all of the studied samples. The M$\text{}_{0}$(P) remains unchanged for most of the samples, except for the La$\text{}_{0.2}$Sr$\text{}_{0.8}$RuO$\text{}_{3}$ sample. The weakening of ferromagnetic interactions with increasing pressure is consistent with complex band structure effects related to the modulation of the Ru-O hybridisation by the change of structural distortion.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 1; 159-163
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segmentation Based on Determinate Chaos of Histological Specimen Images
    Autorzy:
    Orel, V.
    Gusynin, A.
    Selezneva, H.
    Kolesnik, S.
    Stendyk, H.
    Komisarova, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/115899.pdf
    Data publikacji:
    2013
    Wydawca:
    Fundacja na Rzecz Młodych Naukowców
    Tematy:
    image analysis
    segmentation
    histological specimen
    neuroblastoma
    Opis:
    Neuroblastoma is one of the most abundant tumors in infancy and ranks the fourth place among all malignant tumors of children, after acute leukemia, tumors of central nervous system and malignant lymphomas. Histological examination of atypical cell structures is mandatory for diagnosing and forecasting of neoplasm growth .. At present, the image processing of histological specimens is made by a professional histologist manually and is based on visual perception of the histologist. Naturally, visual approach has some shortcomings. Therefore, for objective estimation of medical images, increasing diagnosis accuracy and information processing speed, the computer analysis of histological images is a current need. In this paper, the features of the digital images of histological specimens and methods for digital analysis of medical images are presented. An innovative information system for instant diagnosis of the stage of neuroblastoma based on digital images analysis of histological specimens is developed. In presented studies, a new algorithm, based on deterministic chaos of digital images of histological specimens which uses original formalized indicators (irregularity of contoured zone of diagnostic interest, its structures heterogeneity including cells, nuclei, itochondrion etc.) have been implemented.
    Źródło:
    Challenges of Modern Technology; 2013, 4, 1; 3-8
    2082-2863
    2353-4419
    Pojawia się w:
    Challenges of Modern Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Characterization of Molecular Beam Epitaxy Grown $Cd_{1-x}$Mn$\text{}_{x}$Te Structures
    Autorzy:
    Sawicki, M.
    Kolesnik, S.
    Wojtowicz, T.
    Karczewski, G.
    Janik, E.
    Kutrowski, M.
    Żakrzewski, A.
    Dynowska, E.
    Dietl, T.
    Kossut, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931934.pdf
    Data publikacji:
    1995-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.50.Rr
    75.50.Ee
    Opis:
    The paper reports on the application of SQUID magnetometry to probe magnetic ion distribution in epilayers and at interfaces of diluted magnetic semiconductors. We present also new results on the possible influence of the magnetic confinement on the formation of the spin-glass phase, and on antiferromagnetic phase transition in zinc-blende MnTe.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 1; 169-172
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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