Conductivity of granular superconductors in a strong magnetic field

被引：0
|
作者：
Beloborodov, IS [1 ]
Efetov, KB
机构：
[1] Ruhr Univ Bochum, D-44780 Bochum, Germany
[2] LD Landau Theoret Phys Inst, Moscow 117940, Russia
来源：
ANNALEN DER PHYSIK | 1999年 / 8卷 / 7-9期
关键词：
superconducting fluctuations; tunneling; magnetoresistance;
D O I：
10.1002/(SICI)1521-3889(199911)8:7/9<775::AID-ANDP775>3.0.CO;2-7
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We suggest a theory of the negative magnetoresistance in a metallic granular superconductors. Calculations are performed in a strong magnetic field when the superconducting gap inside the grains is already destroyed by orbital mechanism. We found that even without including the effects of weak localization the conductivity of granular system strongly decreases due to reduction of the density of states by superconducting fluctuations. At the same time, it is shown that Aslamazov-Larkin and Maki-Thompson corrections Vanish at very low temperatures. Our results can explain the unusual experimental behaviour of the resistivity of granular system in a strong magnetic field.
引用
收藏
页码：775 / 784
页数：10
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