Mechanism of Formation of a Negative Magnetoresistance Region in Granular High-Temperature Superconductors

被引：14
|
作者：
Shaikhutdinov, K. A. [1 ]
Balaev, D. A. [1 ]
Popkov, S. I. [1 ]
Petrov, M. I. [1 ]
机构：
[1] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
来源：
PHYSICS OF THE SOLID STATE | 2009年 / 51卷 / 06期
关键词：
MAGNETIC-FIELD; CRITICAL-STATE; YBA2CU3O7-DELTA; HYSTERESIS; MICROSTRUCTURE; COMPOSITES; RESISTANCE; FLUX;
D O I：
10.1134/S106378340906002X
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The field dependences of the magnetoresistance of Bi1.8Pb0.3Sr1.9Ca2Cu3Ox samples with different densities, which have a foam microstructure and exhibit different diamagnetic responses, were studied at 77.4 K to identify the mechanism responsible for the formation of a negative magnetoresistance region in granular high-temperature superconductors. A region with negative magnetoresistance was found to exist in samples with magnetizations highest in absolute magnitude. This behavior finds a reasonable interpretation as due to the effect exerted by dipole moments of high-temperature superconductor grains on the effective intergranular field. The strength of this effective field has been estimated.
引用
收藏
页码：1105 / 1109
页数：5
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