Magnetoresistance of porous polycrystalline HTSC: Effect of the transport current on magnetic flux compression in intergranular medium

Тип публикации: статья из журнала

Год издания: 2014

Идентификатор DOI: 10.1134/S1063783414080034

Аннотация: The hysteretic dependences of the magnetoresistance of porous (38% of the theoretical density) granular high-temperature superconductor (HTSC) Bi1.8Pb0.3Sr1.9Ca2Cu3O (x) have been analyzed in the model of the effective intergranular field. This effective field has been defined by the superposition of the external field and the field induced by magnetic moments of superconducting grains. The magnetic flux compression in an intergranular medium, characterized by the effective field, controls the hysteretic behavior of the magnetoresistance. It has been found that the magnetoresistance hysteresis width for the studied porous HTSC depends on the transport current, in contrast to the superconductor of the same composition with high physical density (more than 90% of the theoretical value). For a porous superconductor, a significant current concentration occurs in the region of the grain boundaries, which is caused by features of its microstructure. A current-induced increase in the effective boundary length results in a decrease in the flux compression, a decrease in the effective field in the intergranular medium, and a magnetoresistance hysteresis narrowing with increasing current.

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 56, Is. 8

Номера страниц: 1542-1547

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Balaev D.A. (Institute of Engineering Physics and Radio Electronics, Siberian Federal University)
  • Popkov S.I. (Institute of Engineering Physics and Radio Electronics, Siberian Federal University)
  • Shaikhutdinov K.A. (Institute of Engineering Physics and Radio Electronics, Siberian Federal University)
  • Petrov M.I. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)
  • Gokhfeld D.M. (Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences)

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