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VOLUME 114 | ISSUE 8 | PAGE 551
Reentrant orbital effect against superconductivity in the quasi-two-dimensional superconductor NbS2
Abstract
We derive integral equation for superconducting gap, which takes into account the quantum nature of electron motion in a parallel magnetic field in a quasi-two-dimensional (Q2D) superconductor in the presence of a non-zero perpendicular field component. By comparison of our theoretical results with the recent experimental data obtained on the NbS2, we show that the orbital effect against superconductivity partially destroys superconductivity in the so-called Ginzburg-Landau area of this Q2D conductor, as expected. Nevertheless, at relatively high magnetic fields, H
\simeq 15 T, the orbital effect starts to improve the Fulde-Ferrell-Larkin-Ovchinnikov phase in the NbS2, due to the quantum nature of electron motion in a parallel magnetic field. In our opinion, this is the most clear demonstration that the orbital effect against superconductivity in a parallel magnetic field has a reentrant nature.