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Wyszukujesz frazę "Wisniewski, R." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Comparison of Flux Pinning in Single Crystals and Melt-Textured YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$
    Autorzy:
    Puźniak, R.
    Wiśniewski, A.
    Baran, M.
    Zhou, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2012973.pdf
    Data publikacji:
    2000-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.60.Ge
    74.60.Jg
    74.72.Bk
    Opis:
    Flux pinning properties of single crystals and melt-textured samples of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-x}$ were studied for external magnetic field oriented parallel and perpendicular to the CuO$\text{}_{2}$ planes (ab-planes). For H ∥ ab vortex behaviour is mainly determined by a very effective intrinsic pinning mechanism. The irreversibility line is located in the region of higher fields and temperatures in comparison with the irreversibility line for H ⊥ ab. In a single crystal for H ⊥ ab, we observed an increase in the critical current density j$\text{}_{c}$ with magnetic field - the so-called "fishtail effect" - in a very broad temperature range. For H ∥ ab, this effect is observed only at temperatures close to T$\text{}_{c}$, when the intrinsic pinning is much weaker.
    Źródło:
    Acta Physica Polonica A; 2000, 97, 3; 373-376
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical Current Limitations and Irradiation Effects in High-Temperature
    Autorzy:
    Wiśniewski, A.
    Puźniak, R.
    Baran, M.
    Szymczak, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929389.pdf
    Data publikacji:
    1993-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.60.Ge
    74.60.Jg
    61.80.Hg
    Opis:
    The discovery of high-temperature superconductors stimulated many groups of researchers to study properties of these materials. From the basic point of view the most important problem is to clarify the mechanism of high-temperature superconductivity. From the practical point of view the most challenging task is to find mechanisms of strong pinning of the vortices, and thereby to obtain materials with high critical current density. The aim of this paper is to discuss problems connected with critical current limitations and to present possibilities which offer irradiation effects with respect to critical current enhancement.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 1; 139-164
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and Superconductivity of $FeSe_{1 - x}$ and $FeTe_{1 - y}Se_{y}$ Crystals: Dependence on the Synthesis Methods, Starting Composition, and Growth Conditions
    Autorzy:
    Gawryluk, D.
    Fink-Finowicki, J.
    Wiśniewski, A.
    Puźniak, R.
    Domukhovski, V.
    Diduszko, R.
    Berkowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1537007.pdf
    Data publikacji:
    2010-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    74.25.Ha
    74.62.Bf
    74.70.Xa
    81.10.Fq
    Opis:
    Syntheses of superconducting iron chalcogenides $FeSe_{1 - x}$ (x = 0-0.15) and $FeTe_{1 - y}Se_{y}$ (y = 0.3-0.55) were performed. Superconducting phase of iron selenide was obtained by the solid-state reaction and from liquid phase. The highest values of critical temperature ($T_c$ = 8.2-8.7 K) exhibit $FeSe_{1-x}$ obtained by the crystallization from a melt with excess of iron less than 1 mol%. The samples from a melt contain up to 78% of tetragonal phase, as estimated by the X-ray diffraction. Lattice parameters and unit cell volume for the samples exhibiting highest $T_{c}$ and sharpest transition to superconducting state are limited to narrow range, with c/a ratio close to 1.469. The samples with excess of selenium contain higher amount of hexagonal phase than stoichiometric one. Superconducting single-crystalline samples of $FeTe_{1 - y}Se_{y}$ (up to 100% of tetragonal phase) were obtained using Bridgman's method. When y value increases, the volume of unit cell decreases. The critical temperature $T_{c}$ changes from ≈ 11.5 K for y ≈ 0.3 to ≈ 14.7 K for y ≈ 0.5.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 2; 331-335
    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
      Wyświetlanie 1-5 z 5

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