Multi-band analysis on physical properties of superconducting FeSe films  

作　　者：车剑韬 叶晨骁 Jian-Tao Che;Chen-Xiao Ye(Department of Mathematics and Physics,North China Electric Power University,Beijing 102206,China;School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]Department of Mathematics and Physics,North China Electric Power University,Beijing 102206,China [2]School of Nuclear Science and Engineering,North China Electric Power University,Beijing 102206,China

出　　处：《Chinese Physics B》2023年第9期449-454,共6页中国物理B（英文版）

摘　　要：The origins of superconductivity and pairing symmetry of order parameters are still controversial problems for FeSe thin films up to date.Under the Neumann boundary conditions,the electromagnetic properties of this system are investigated using the two-band Ginzburg-Landau theory.We calculate the temperature dependence of upper critical field in arbitrary direction and critical supercurrent density through the FeSe film.It is revealed that the normalized upper critical field is independent of the film thickness and all of our theoretical results are in accordance with the experimental data.These thus strongly indicate the existence of two-gap s-wave superconductivity in this material.

关 键 词：Ginzburg-Landau theory two-band s-wave superconductivity FeSe film 

分 类 号：O484[理学—固体物理]