Compression of a magnetic flux in the intergrain medium of a YBa2Cu3O7 granular superconductor from magnetic and magnetoresistive measurements

Тип публикации: статья из журнала

Год издания: 2011

Идентификатор DOI: 10.1063/1.3657775

Ключевые слова: Effective field, External fields, Field dependence, Field induced, Granular superconductors, Inter-grain, Josephson, Magnetoresistive, Space between, Superconducting grains, Transport currents, Electric resistance, Magnetic flux, Magnetic moments, Superconductivity, Superconducting materials

Аннотация: A method to determine a value of the effective field in the intergrain medium of a granular superconductor is proposed. The space between superconducting grains is considered to be a Josephson medium where passage of the transport current causes dissipation and the effective field is superposition of external field H and the field induced by magnetic moments of superconducting grains. The method proposed is based on the comparison of hysteresis field dependences of magnetoresistance and magnetization and their relaxation at H=const. By the example of granular YBa2Cu3O7, it is shown that, in the region of weak fields, the effective field in the intergrain medium exceeds by far the external field, i.e., compression of a magnetic flux occurs. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3657775]

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Издание

Журнал: JOURNAL OF APPLIED PHYSICS

Выпуск журнала: Vol. 110, Is. 9

ISSN журнала: 00218979

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

Авторы

  • Balaev D.A. (Siberian Federal University)
  • Popkov S.I. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Semenov S.V. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Shaykhutdinov K.A. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Shabanov A.V. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Petrov M.I. (Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Sabitova E.I. (Siberian Federal University)

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