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arXiv 1610.08641cond-mat.supr-con
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电子间有限程相互作用模型中的上临界场

Upper critical field in the model with finite range interaction between electrons

A. V. Shumilin, V. V. Baranov, V. V. Kabanov

摘要:

本文发展了电子间存在非定域相互作用的BCS超导体的上临界场理论。我们证明了非定域相互作用可用参数$k_Fρ_0$来表征,其中$k_F$是费米动量,$ρ_0$是电子-电子相互作用半径.外部磁场的存在导致产生具有不同角动量的序参量的附加分量。这一效应导致了轨道极限场之上的上临界场的增强。此外,向上的曲率的温度依赖性的$H_{c2}(T)$在清洁的极限进行了预测。杂质散射抑制了肮脏极限的影响。

英文摘要:

We develop a theory of the upper critical field in a BCS superconductor with a nonlocal interaction between electrons. We have shown that the nonlocal interaction is characterized by the parameter $k_Fρ_0$ where $k_F$ is the Fermi momentum and $ρ_0$ is the radius of electron-electron interaction. The presence of the external magnetic field leads to the generation of additional components of the order parameter with different angular momentum. This effect leads to the enhancement of the upper critical field above the orbital limiting field. In addition the upward curvature in the temperature dependence of $H_{c2}(T)$ in the clean limit is predicted. The impurity scattering suppresses the effect in the dirty limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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