Correlation Between Magnetoresistance and Magnetization Hysteresis in a Granular High-T C Superconductor: Impact of Flux Compression in the Intergrain Medium

被引：12

作者：

Balaev, D. A. ^{[1
]}

Semenov, S. V. ^{[1
]}

Petrov, M. I. ^{[1
]}

机构：

[1] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

来源：

JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2014年 / 27卷 / 06期

关键词：

Granular superconductor; Josephson medium; Effective field; Magnetoresistance; Magnetization hysteresis; HIGH-TEMPERATURE SUPERCONDUCTOR; CRITICAL-STATE; YBA2CU3O7-DELTA; BEHAVIOR; HTSC; RESISTANCE; MOTION; FIELDS;

D O I：

10.1007/s10948-014-2491-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The correlation between experimental magnetic field dependences of magnetoresistance and magnetization hysteresis in granular YBa2Cu3O7 is established. Within the proposed approach, magnetoresistance is assumed to be determined by the effective field in the intergrain boundaries the ensemble of which is considered to be a Josephson medium. The effective field in the intergrain medium can be written in the form B (eff)(H)=H-4 pi M(H)x alpha, where alpha is the parameter of averaged demagnetizing factors of grains and the degree of flux compression. A comparison of experimental magnetoresistance R(H) and magnetization M(H) hysteresis dependences obtained at different external magnetic field sweep rates yields the value alpha similar to 10, which is caused by the flux compression between grains. The proposed model describes well most of the features of the magnetoresistance hysteresis in granular high-T (C) superconductors.

引用

页码：1425 / 1429

页数：5

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