A.C. susceptibility and magnetization measurements on a sintered YBa2Cu3O7−y sample are presented. The measured magnetization is separated into two terms: one depending on the grains, the other on the intergranular region magnetization. For intergranular region we intend a desordered array of holes surrounded by a shell whose thickness is λ at the surface of the grains connected through Josephson junctions. At these holes the fluxoids are pinned. In presence of a fluxoid gradient, a net macroscopic magnetization current results from the sum of all the microscopic components, as in the traditional type II superconductors. The contribution of the intergranular region to the magnetization is well explained in terms of the critical state model, if a critical current density strongly dependent on the magnetic field is assumed.

A.C. susceptibility and magnetization of high-Tc superconductors: Critical state model for the intergranular region

PUTTI, MARINA;SIRI, ANTONIO
1989-01-01

Abstract

A.C. susceptibility and magnetization measurements on a sintered YBa2Cu3O7−y sample are presented. The measured magnetization is separated into two terms: one depending on the grains, the other on the intergranular region magnetization. For intergranular region we intend a desordered array of holes surrounded by a shell whose thickness is λ at the surface of the grains connected through Josephson junctions. At these holes the fluxoids are pinned. In presence of a fluxoid gradient, a net macroscopic magnetization current results from the sum of all the microscopic components, as in the traditional type II superconductors. The contribution of the intergranular region to the magnetization is well explained in terms of the critical state model, if a critical current density strongly dependent on the magnetic field is assumed.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/378860
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