论文标题
无序膜中的超导抑制：二维扩散和三维弹道的相互作用
Superconductivity suppression in disordered films: Interplay of two-dimensional diffusion and three-dimensional ballistics
论文作者
论文摘要
均匀无序的超导膜中临界温度的抑制是疾病引起的库仑排斥力增强的结果。我们证明，对于现在研究的大多数薄膜，在假设电子运动的二维扩散性质中无法完全解释这种效果。对$ T_C抑制的主要贡献是从校正到电子 - 电子相互作用常数来自Fermi波长的小尺度，从而导致临界温度转移$ΔT_C/t_c/t_ {c0} \ sim -1/k_fl $，其中$ k_f $是$ k_f $是$ k_f $是fermi is formi Mompant and $ l $是免费的。因此，几乎对于所有遵循$ t_c $抑制的费米子场景随着薄膜厚度的降低而导致的超级传导膜，这种效果是由与三维安德森本地化阈值的接近性造成的，并且由参数$ k_f l $而不是膜电阻的参数控制。
Suppression of the critical temperature in homogeneously disordered superconducting films is a consequence of the disorder-induced enhancement of Coulomb repulsion. We demonstrate that for the majority of thin films studied now this effect cannot be completely explained in the assumption of two-dimensional diffusive nature of electrons motion. The main contribution to the $T_c$ suppression arises from the correction to the electron-electron interaction constant coming from small scales of the order of the Fermi wavelength that leads to the critical temperature shift $δT_c/T_{c0} \sim - 1/k_Fl$, where $k_F$ is the Fermi momentum and $l$ is the mean free path. Thus almost for all superconducting films that follow the fermionic scenario of $T_c$ suppression with decreasing the film thickness, this effect is caused by the proximity to the three-dimensional Anderson localization threshold and is controlled by the parameter $k_F l$ rather than the sheet resistance of the film.
