Reentrant Orbital Effect against Superconductivity in the QuasiTwoDimensional Superconductor NbS_{2}
Abstract
We derive an integral equation for the superconducting gap, which takes into account the quantum nature of electron motion in a parallel magnetic field in a quasitwodimensional superconductor in the presence of a nonzero perpendicular field component. By comparison of our theoretical results with the recent experimental data obtained on NbS_{2}, we show that the orbital effect against superconductivity partially destroys superconductivity in the socalled GinzburgLandau area of this quasitwodimensional conductor, as expected. Nevertheless, at relatively high magnetic fields, $H ∼eq 15$ T, the orbital effect starts to improve the FuldeFerrellLarkinOvchinnikov phase in NbS_{2}, due to the quantum nature of electron motion in a parallel magnetic field. In our opinion, this is the clearest demonstration that the orbital effect against superconductivity in a parallel magnetic field has a reentrant nature.
 Publication:

Soviet Journal of Experimental and Theoretical Physics Letters
 Pub Date:
 October 2021
 DOI:
 10.1134/S0021364021200017
 arXiv:
 arXiv:2103.15197
 Bibcode:
 2021JETPL.114..479L
 Keywords:

 Condensed Matter  Superconductivity
 EPrint:
 6 pages, no figures