Two-band analysis on the upper critical field for superconductor NbS<Subscript>2</Subscript>

Based on two-band Ginzburg-Landau theory, we study the temperature and angular dependences of upper critical field for superconducting crystal NbS<Subscript>2</Subscript>. All the results fit the experimental data well. We thus conclude that NbS<Subscript>2</Subscript> is another example of two-gap superconductors. Our calculations also indicate that the larger gap opens in the quasi-two-dimensional Nb-derived bands. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013