Eur. Phys. J. B (2013) 86: 135
https://doi.org/10.1140/epjb/e2013-30951-4

Regular Article

Two-band analysis on the upper critical field for superconductor NbS₂

Department of Mathematics and Physics, North China Electric Power University, Beijing 102206, P.R. China

^a e-mail: huanghai1180@163.com

Received: 18 October 2012
Received in final form: 23 January 2013
Published online: 8 April 2013

Abstract

Based on two-band Ginzburg-Landau theory, we study the temperature and angular dependences of upper critical field for superconducting crystal NbS₂. All the results fit the experimental data well. We thus conclude that NbS₂ is another example of two-gap superconductors. Our calculations also indicate that the larger gap opens in the quasi-two-dimensional Nb-derived bands.