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Wyszukujesz frazę "Stańkowski, A." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Magnetic Ground State of Fullerenes
    Autorzy:
    Koper, A.
    Stankowski, J.
    Thomas, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1930574.pdf
    Data publikacji:
    1994-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Hk
    75.25.+z
    36.40.+d
    Opis:
    The classical limit of the effective antiferromagnetic Heisenberg Hamiltonian has been investigated on the series of free clusters (molecules) of C$\text{}_{N}$ (N = 32, 44, 50, 58, 60,, 70 and 84). The valley structures of the frustrated ground states were determined. Moreover, the probability distributions of the spin correlation functions were calculated.
    Źródło:
    Acta Physica Polonica A; 1994, 85, 2; 351-355
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Crystalline Structure, Stoichiometry and Magnetic Properties of the Morasko Meteorite
    Autorzy:
    Idzikowski, B.
    Kováč, J.
    Diko, P.
    Stankowski, W.
    Muszyński, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535541.pdf
    Data publikacji:
    2010-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.65.Sn
    75.50.Bb
    67.80.dk
    Opis:
    The composition and structure of iron-nickel alloys smithereens extracted from the Morasko (Poland) Meteorite (fell ∿ 5 ka BP) were investigated by optical metallographic techniques, scanning electron microscopy and electron microprobe analysis, thermal analyses, magnetic measurements and X-ray diffraction. Microstructural analysis by scanning electron microscopy and optical microscopy has shown that the sample is composed from large grains of Fe-Ni alloy in which secondary phase crystals with well developed crystal habits and the size about 10 micrometers are distributed. Thermal analyses confirmed that the transformation from alpha to gamma Fe-Ni solid solution appearing as a function of temperature corresponds to about 5 wt% Ni in the Fe-Ni alloy. Possible scenario of the extraterrestrial sample solidification is related to the microstructural and magnetic behavior.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 5; 1071-1073
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxygen Deficient YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$: Two Superconducting Phases
    Autorzy:
    Stankowski, J.
    Ślązak, A.
    Kempiński, W.
    Andrzejewski, B.
    Reichel, B.
    Plesch, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037166.pdf
    Data publikacji:
    2004-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.72.-h
    74.62.Bf
    74.62.-c
    74.25.Nf
    Opis:
    A set of oxygen deficient powder and granular samples of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ ceramics was studied by means of thermogravimetric and magnetically modulated microwave absorption methods. Especially the last method has turned out to be a powerful method, which was used to determine the dependence of critical temperature T$\text{}_{c}$ on the oxygen parameterδ. Using these methods it has been shown that the removing of oxygen evokes the inhomogeneous oxygen distribution in the samples and a change in carrier concentration till to the loss of superconducting properties. A superconducting phase with T$\text{}_{c}$=60 K, which occurs in oxygen deficient YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ sample, is an unstable phase.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 3; 287-294
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ Melt Textured Samples Prepared by Powder Melting Process and Quench and Melt Growth Techniques
    Autorzy:
    Plesch, G.
    Cígaň, A.
    Maňka, J.
    Bučkuliaková, A.
    Hanic, F.
    Buchta, Š.
    Andrzejewski, B.
    Stankowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014193.pdf
    Data publikacji:
    2000-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.80.Bj
    Opis:
    The microstructure and magnetic properties of the melt textured YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ samples prepared by the powder melting process, in which Y$\text{}_{2}$Cu$\text{}_{2}$O$\text{}_{5}$ and BaCuO$\text{}_{2}$ were used as precursors, and those prepared by the quench and melt growth method are described and compared. The lattice parameters and T$\text{}_{c}$ values for the samples prepared by the both techniques were similar. The penetration and the spatial distribution of the magnetic flux in the superconducting samples was imaged by means of a field-mapping device using a Hall probe. In the range of low magnetic fields up to 820Am$\text{}^{-1}$ no significant differences in penetration of magnetic flux between the samples prepared by the powder melting process and the quench and melt growth were observed. The mapping could not resolve any grain boundaries, single grains and structural defects. By the ac and virgin volume magnetisation characteristics, which were measured in the zero-field cooled condition by a 2nd order SQUID gradiometer, no weak links were identified. Better magnetic properties of the quench and melt growth samples in high magnetic fields can be explained by the differences in microstructure and/or by the risen content of the finely dispersed 211 and Pt containing phases. The increase factor in magnetisation is about 2.5. Some aspects of the Bean model for textured YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ samples are discussed.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 4; 327-334
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of YBCO-PST Composites
    Autorzy:
    Andrzejewski, B.
    Kaczmarek, A.
    Stankowski, J.
    Hilczer, B.
    Marfaing, J.
    Régnier, S.
    Caranoni, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014556.pdf
    Data publikacji:
    2000-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.80.Bj
    74.25.Ha
    76.30.Fc
    Opis:
    The magnetic properties of granular superconductor-insulator composites were investigated. The composites were random composition of the YBa$\text{}_{2}$Cu$\text{}_{3}$O$\text{}_{7-δ}$ (YBCO) high-temperature superconductor and Pb(Sc$\text{}_{0.5}$Ta$\text{}_{0.5}$)O$\text{}_{3}$ (PST) ferroelectric insulator. The composites exhibited lower superconducting volume ratio than the YBCO content. For samples with YBCO content low enough no global (the whole sample) and local (separated grains) superconductivity was observed. The observed decay of the superconductivity, lowering of the critical temperature, and the increase in number of paramagnetic centres as PST content increases are explained assuming reaction among YBCO and PST phases and possible formation of an additional ones, which did not exist in the initial powders.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 6; 739-746
    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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