论文标题
在肮脏的超导膜和异质结构中扩大了Yu-Shiba-Rusinov国家
Broadened Yu-Shiba-Rusinov states in dirty superconducting films and heterostructures
论文作者
论文摘要
超导体中潜在和磁性障碍的相互作用一直是数十年来的积极研究领域。在USADEL方程的框架内，我们研究了肮脏的超导膜中孤立的经典磁杂质附近状态的局部密度。我们发现，潜在的疾病会导致在Yu-Shiba-Rusinov（YSR）能量状态的局部密度中扩大了三角洲功能。这种扩展与膜的正常状态扩散电阻的平方根成正比。我们证明，由潜在疾病引起的介观波影响至关重要的是YSR能量附近状态的局部密度的特征。此外，我们证明了扫描肺泡微观镜尖端可以掩盖状态局部密度的YSR特征。此外，我们研究位于肮脏超导体/正常金属连接的正常区域的一系列磁杂质附近的局部密度。我们发现在YSR能量附近的状态的局部密度中有共鸣。谐振峰的能量尺度由正常状态下膜电阻的平方根控制。
The interplay of a potential and magnetic disorder in superconductors remains an active field of research for decades. Within the framework of the Usadel equation, we study the local density of states near a solitary classical magnetic impurity in a dirty superconducting film. We find that a potential disorder results in broadening of the delta-function in the local density of states at the Yu-Shiba-Rusinov (YSR) energy. This broadening is proportional to the square root of a normal-state spreading resistance of the film. We demonstrate that mesoscopic fluctuations caused by a potential disorder affect crucially a profile of the local density of states in the vicinity of the YSR energy. In addition, we demonstrate that a scanning-tunneling-microscopy tip can mask an YSR feature in the local density of states. Also, we study the local density of states near a chain of magnetic impurities situated in the normal region of a dirty superconductor/normal-metal junction. We find a resonance in the local density of states near the YSR energy. The energy scale of the resonant peak is controlled by the square root of the film resistance per square in the normal state.
