Transport theory of superconductors with singular interaction corrections
Transport theory of superconductors with singular interaction corrections
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具有奇异相互作用修正的超导体输运理论
DOI：
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发表时间：
2010
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通讯作者：
A. Levchenko
中科院分区：
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作者：
A. Levchenko
研究了强涨落对超导体在经典临界点附近输运性质的影响。在这种情况下，电导率是由两种相互竞争的效应的微妙相互作用决定的。第一个是库珀通道中强的电子-电子相互作用增加了波动库珀对的寿命，从而增强了电导率。另一方面，量子对断裂效应倾向于抑制超导性。这些过程之间的相互作用定义了新的温度状态，Gi {le} T-T{sub c}/T{sub c} {le} {radical}Gi，其中波动诱导的传输变得更加奇异，这里Gi是金兹伯格数。电导率的最奇异的贡献来自动态Aslamazov-Larkin项，和有趣的Maki-Thompson和干扰校正。交叉温度T{sub c}{radical}Gi从弱到强的波动制度自洽地产生的结果的动态变化的顺序参数的散射。我们认为，探测超导体非线性涨落的方法是在垂直场中测量磁导率。
We study effects of strong fluctuations on the transport properties of superconductors near the classical critical point. In this regime conductivity is set by the delicate interplay of two competing effects. The first is that strong electron-electron interactions in the Cooper channel increase the lifetime of fluctuation Cooper pairs and thus enhance conductivity. On the other hand, quantum pair-breaking effects tend to suppress superconductivity. An interplay between these processes defines new temperature regime, Gi {le} T-T{sub c}/T{sub c} {le} {radical}Gi, where fluctuation induced transport becomes more singular, here Gi is the Ginzburg number. The most singular contributions to the conductivity stem from the dynamic Aslamazov-Larkin term, and interesting Maki-Thompson and interference corrections. The crossover temperature T{sub c}{radical}Gi from weakly to strongly fluctuating regime is generated self-consistently as the result of scattering on dynamic variations in the order parameter. We suggest that the way to probe nonlinear fluctuations in superconductors is by magnetoconductivity measurements in the perpendicular field.