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arXiv 0707.4237cond-mat.supr-concond-mat.mes-hall
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超导结构中颗粒度的涨落谱

Fluctuation spectroscopy of granularity in superconducting structures

I. V. Lerner, A. A. Varlamov, V. M. Vinokur

摘要:

我们建议使用“波动光谱”作为一种方法来检测接近超导过渡的无序金属的粒度。我们表明,随着温度降低$T$的电阻$R(T)$的系统相对较大的晶粒最初增长由于波动抑制的单电子隧穿,但随着进一步降低$T$由于相干电荷转移的波动库珀对。在一定条件下,这种最大值在$R(T)$原来是敏感的弱磁场由于一种新的Maki -汤普森型机制。

英文摘要:

We suggest to use `fluctuation spectroscopy' as a method to detect granularity in a disordered metal close to a superconducting transition. We show that with lowering temperature $T$ the resistance $R(T)$ of a system of relatively large grains initially grows due to the fluctuation suppression of the one-electron tunneling but decreases with further lowering $T$ due to the coherent charge transfer of the fluctuation Cooper pairs. Under certain conditions, such a maximum in $R(T)$ turns out to be sensitive to weak magnetic fields due to a novel Maki -- Thompson type mechanism.

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