Degradation Mechanism of the Superconducting Transition Temperature in Nb Thin Films

被引：4

作者：

Song Xiao-Hui ^{[1
]}

Jin Yi-Rong ^{[1
]}

Fan Zhen-Jun ^{[2
]}

Mi Zhen-Yu ^{[1
]}

Zhang Dian-Lin ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

[2] China Univ Geosci, Sch Sci, Beijing 100083, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2015年 / 32卷 / 04期

基金：

中国国家自然科学基金;

关键词：

CRYSTAL NIOBIUM FILMS; TC; LOCALIZATION; THICKNESS;

D O I：

10.1088/0256-307X/32/4/047403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Systemic measurements show that there is no 3D to 2D crossover in the reduction of the superconducting transition temperature T-c in Nb thin films. This result is consistent with all previous measurements while it is contrary to the prevailing understanding based on the interplay between proximity, localization, and lifetime broadening. Our study indicates that the decrease of T-c can be interpreted by the combined effects of electron-phonon coupling parameter lambda and the defect scattering rate rho(w), being uniquely determined by their ratio lambda/rho(w). Other factors such as film thickness and irradiation do not produce additional effects beyond these two parameters.

引用

页数：4

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