Modified Ambegaokar-Halperin model and dissipation in the polycrystalline Ba2YCu3O7-δ superconductor

被引：0
|
作者：
Bhalla, GL [1 ]
Malik, P [1 ]
Malik, A [1 ]
机构：
[1] Univ Delhi, Dept Phys & Astrophys, Delhi 110007, India
来源：
MODERN PHYSICS LETTERS B | 2004年 / 18卷 / 2-3期
关键词：
magnetoresistance; dissipation; vortices; fluctuations;
D O I：
10.1142/S0217984904006718
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The magnetoresistance curves of polycrystalline Ba2YCu3O7-delta samples for H = 0, 1050 and 4880 G axe analyzed using the modified Ambegaokar-Halperin model. The analysis shows the occurrence of a crossover in the R-T curves at a field dependent temperature T-BP, revealing that the dissipation in Ba2YCu3O7-delta samples is possibly caused by two different mechanisms: vortex-dynamics in the low temperature region (below T-BP) and the order parameter fluctuations in the high temperature region (above T-BP).
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页码：99 / 103
页数：5
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