Contributions from inter-grain boundaries to the magneto-resistive effect in polycrystalline high-TC superconductors. the underlying reason of different behavior for YBCO and BSCCO systems : научное издание | Научно-инновационный портал СФУ

Contributions from inter-grain boundaries to the magneto-resistive effect in polycrystalline high-TC superconductors. the underlying reason of different behavior for YBCO and BSCCO systems : научное издание

Тип публикации: статья из журнала

Год издания: 2011

Ключевые слова: BSCCO, Intergrain boundaries, magnetoresistance, Ybco

Аннотация: In order to clarify the mechanisms in charge of broadening of resistive transition R(T) in magnetic fields of bismuth-based polycrystalline high-TC superconductor (HTSC), a comparative study of Bi1.8Pb 0.3Sr1.9Ca2Cu3Ox (BSCCO) and YBa2Cu3O7-δ(YBCO) have been performed. Magnetoresistive effects and irreversibility line obtained from magnetic measurements have been studied. It was established that (1) for YBCO, the smooth part of R(T) dependence unambiguously corresponds to dissipation in the intergrain boundaries for arbitrary magnetic fields; (2) for polycrystalline BSCCO, the smooth part of R(T) dependences correspond to dissipation within intergrain boundary subsystem in the field range H 102 Oe only, while standard measurements of R(T) dependences in magnetic field range H 102 Oe reflect the dissipation processes occurring both in intergrain boundary and HTSC grain subsystems; (3) for the high-field range, the contribution from intergrain boundaries of BSCCO can be distinguished from magnetoresistance R(H) dependences obtained at high enough current density on textured samples. It is proposed that various magneto-resistive properties of these classical HTSC systems are due comparatively weak pinning in BSCCO. © 2011 Springer Science+Business Media, LLC.

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Издание

Журнал: Journal of Superconductivity and Novel Magnetism

Выпуск журнала: Т. 24, 7

Номера страниц: 2129-2136

ISSN журнала: 15571939

Издатель: Springer New York LLC

Авторы

  • Balaev D.A. (Siberian Federal University)
  • Popkov S.I. (Siberian Federal University)
  • Semenov S.V. (L.V. Kirensky Institute of Physics)
  • Bykov A.A. (L.V. Kirensky Institute of Physics)
  • Dubrovskiy A.A. (Siberian Federal University)
  • Shaikhutdinov K.A. (Siberian Federal University)
  • Petrov M.I. (L.V. Kirensky Institute of Physics)
  • Sabitova E.I. (Siberian Federal University)

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