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    Wyświetlanie 1-3 z 3
    Tytuł:
    Magnetic Properties of a Melt-Textured Pellet of $(Nd_{0.33}Eu_{0.38}Gd_{190.28})Ba_2Cu_3O_y$ + 0.035 mol% Zn
    Autorzy:
    Jirsa, M.
    Rameš, M.
    Muralidhar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813616.pdf
    Data publikacji:
    2008-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.60.Ge
    Opis:
    Recently, a striking positive effect of tiny Zn doping on crystal growth quality has been found in melt-textured $(Nd, Eu, Gd)Ba_2Cu_3O_y$ pellets. The material could be easily grown from MgO seed, possessing a rather high lattice mismatch to the superconducting compound. In the present work we study spatial distribution of local magnetic properties and chemical composition of a $(Nd_{0.33}Eu_{0.38}Gd_{0.28})Ba_2Cu_3O_y$ + 0.035 mol% Zn pellet. The plane cutting the pellet into two halves along the symmetry axes of the opposite a-axis growth sectors is investigated. While the chemical composition only slightly fluctuates, magnetic properties show quite an interesting spatial variation.
    Źródło:
    Acta Physica Polonica A; 2008, 113, 1; 223-226
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Clean bulk YBaCuO superconductors doped by paramagnetic ions of Sm and Yb
    Autorzy:
    Jirsa, M.
    Volochová, D.
    Kováč, J.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054700.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Op
    74.25.Sv
    74.60.Ge
    74.72.-h
    Opis:
    The recently developed clean cuprate technology was employed to study the effect of tiny amounts of paramagnetic Yb and Sm ions on electromagnetic properties of bulk YBaCuO. Small samples of about 1.5×1.5×0.5 mm³ were measured by vibrating sample magnetometer in the field range ±9 T and temperatures 30 K to 10 K in the non-superconducting tetragonal state and 300 K to 70 K in the orthorhombic, superconducting state. In the latter case, we observed the reversible paramagnetic moment above T_{C}, similar as in the tetragonal state. Below T_{C} an irreversible magnetic moment was observed from which critical current density, J_c, was evaluated using the extended Bean model. The effect of doping by Yb and Sm ions on J_c was studied and a correlation between J_c and the total paramagnetic moment was found. Both J_c(B) and the normalized pinning force density as a function of the reduced magnetic field were analyzed in terms of the classical model and discussed with respect to the material anisotropy, giving us at least a rough idea on the type of the effective pinning type and mechanism.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1027-1029
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electromagnetic Properties of Melt-Grown YBaCuO Superconductors Doped by Gd and Sm
    Autorzy:
    Jirsa, M.
    Rameš, M.
    Volochová, D.
    Radušovská, M.
    Diko, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1371409.pdf
    Data publikacji:
    2014-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.Ha
    74.25.Op
    74.25.Sv
    74.60.Ge
    74.72.-h
    Opis:
    Electromagnetic properties of $YBa_{2}Cu_{3}O_{y}$ samples melt-grown in air and doped with small amounts of light rare earth (LRE) ions Gd and Sm were studied. The LRE doping creates a point-like disorder contributing to the second peak on the magnetization curve. In the field range of the second peak the average magnetic moment, $M_{av}$, deduced from the magnetization curves exhibited strong fluctuations. $M_{av}$ is commonly regarded as an equilibrium moment close to the thermodynamic reversible one, obeying in intermediate fields a logarithmic field dependence. However, in our experiments $M_{av}(B)$ curves failed to follow such a dependence below irreversibility line. $M_{av}(B)$ curves deduced from rather static measurements, done by SQUID magnetometer still showed the disturbance but significantly weaker. It indicates that this feature reflects the vortex dynamics in the second peak region. Its scaling with temperature was found to coincide with that of the pinning force.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 1; 326-327
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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