Interference-induced surface superconductivity: Enhancement by tuning the Debye energy
Yunfei Bai, Yajiang Chen, M. D. Croitoru, A. A. Shanenko, Xiaobing Luo, Yunbo Zhang
DOI 10.1103/PhysRevB.107.024510 · Physical Review B
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Abstract
In the usual perception, surface superconductivity is associated with the surface nucleation of a superconducting condensate above the upper critical field in type-II superconductors or with a rearrangement of phonon properties and the electron-phonon coupling near surfaces/interfaces. Recently, it has been found that there is another example when the surface superconducting temperature is increased up to 20–25% as compared to the bulk one due to constructive interference of superconducting pair states. In the present work, we demonstrate that in fact, such an interference-induced enhancement can be much more pronounced, up to nearly 70%. Furthermore, here it is shown that such an interference enhancement persists over a wide range of microscopic parameters.
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