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arXiv 0902.3396cond-mat.mes-hallcond-mat.supr-con
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界面散射和非弹性散射对扩散约瑟夫森结SNS电子熵和specific heat的影响

Influence of interface transmissivity and inelastic scattering on the electronic entropy and specific heat of diffusive SNS Josephson junctions

H. Rabani, F. Taddei, F. Giazotto, R. Fazio

摘要:

从理论上研究了扩散超导体-正常金属-超导体(SNS)约瑟夫森结中的电子熵和比热。特别是,我们认为在实际实验中发生的非理想性的影响,如在NS接口,自旋翻转和非弹性散射在N区域和准粒子亚带隙状态的超导体中的势垒的存在。我们发现,自旋翻转和非弹性散射没有,典型的参数值,一个大的影响。相反,势垒的存在抑制了N区的超导关联,其结果是熵和比热最终降低到不透明界面不存在超导性时的熵和比热。最后,我们建议一个实验,并检查它是可能的,在现实条件下,测量电子比热的超导体之间的相位差的依赖关系。

英文摘要:

We study theoretically the electronic entropy and specific heat in diffusive superconductor-normal metal-superconductor (SNS) Josephson junctions. In particular, we consider the influence of non-idealities occurring in an actual experiment, such as the presence of barriers at the NS interfaces, the spin-flip and inelastic scattering in the N region and quasiparticle subgap states in the superconductors. We find that spin-flip and inelastic scattering do not have, for typical parameters values, a large effect. On the contrary, the presence of barriers suppresses the superconducting correlations in the N region, with the consequence that the entropy and the specific heat get reduced eventually to those in the absence of superconductivity for opaque interfaces. Finally we suggest an experiment and check that it is possible, under realistic conditions, to measure the dependence of electronic specific heat on the phase difference between the superconductors.

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