Degradation Mechanism of the Superconducting Transition Temperature in Nb Thin Films
SONG Xiao-Hui1**, JIN Yi-Rong1, FAN Zhen-Jun2, MI Zhen-Yu1, ZHANG Dian-Lin1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 2School of Sciences, China University of Geosciences, Beijing 100083
Abstract：Systemic measurements show that there is no 3D to 2D crossover in the reduction of the superconducting transition temperature Tc 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 Tc can be interpreted by the combined effects of electron-phonon coupling parameter λ and the defect scattering rate ρw, being uniquely determined by their ratio λ/ρw. Other factors such as film thickness and irradiation do not produce additional effects beyond these two parameters.
. [J]. 中国物理快报, 2015, 32(4): 47403-047403.
SONG Xiao-Hui, JIN Yi-Rong, FAN Zhen-Jun, MI Zhen-Yu, ZHANG Dian-Lin. Degradation Mechanism of the Superconducting Transition Temperature in Nb Thin Films. Chin. Phys. Lett., 2015, 32(4): 47403-047403.
2015, Vol. 32 
