From orbital to paramagnetic pair breaking in layered superconductor 2H-NbS${}_2$

Abstract

The superconducting transition metal dichalcogenides 2H-NbSe${}_2$ and 2H-NbS${}_2$ are intensively studied on account of their unique electronic properties such as Ising superconductivity, found in multi- and monolayers, with upper critical fields beyond the Pauli limit. Even in bulk crystals, there are reports of multiband superconductivity and exotic states, such as the Fulde-Ferrell-Larkin-Ovchinnikov phase. In this work, we investigate the superconducting properties of 2H-NbS${}_2$ through a detailed high-field mapping of the phase diagram by means of magnetotransport and magnetostriction experiments. We compare the phase diagram between bulk crystals and a 6~nm thick flake of 2H-NbS${}_2$ and find a drastically enhanced Maki parameter in the flake, signifying a change of the relevant pair breaking mechanism from orbital to paramagnetic pair breaking, which we attribute to an effect of enhanced spin-orbit coupling.

arXiv comment17 pages, 3 figures

References in corpus (34)

• Evidence of Ising pairing in superconducting NbSe${}_2$ atomic layers
• Two Dimensional Ising Superconductivity in Gated MoS${}_2$
• Enhancement of the upper critical field by nonmagnetic impurities in dirty two-gap superconductors
• Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
• Tuning Ising superconductivity with layer and spin-orbit coupling in two-dimensional transition-metal dichalcogenides
• Superconducting density of states and vortex cores of 2H-NbS2
• Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2
• Ising Superconductivity and Majorana Fermions in Transition Metal Dichalcogenides
• Origin of superconductivity and latent charge density wave in NbS${}_2$
• Patterns and driving forces of dimensionality-dependent charge density waves in 2H-type transition metal dichalcogenides
• Evidence for dominant Pauli paramagnetic effect in the upper critical fields of a FeTe0.6Se0.4 superconductor
• Pauli-limiting effects in the upper critical fields of a clean LiFeAs single crystal
• Gate-Induced Interfacial Superconductivity in 1T-SnSe2
• Evidence for an FFLO state with segmented vortices in the BCS-BEC-crossover superconductor FeSe
• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor
• Quantum enhancement of charge density wave in NbS${}_2$ in the 2D limit
• Anharmonic suppression of Charge density wave in 2H-NbS${}_2$
• Ising superconductivity and magnetism in NbSe${}_2$
• Pressure dependence of superconducting critical temperature and upper critical field of 2H-NbS2
• Evolution of superconductivity in ultrathin NbS2
• Traces of Charge Density Waves in NbS${}_2$
• Specific-heat measurements of superconducting NbS2 single crystal in an external magnetic field: Study on the energy gap structure
• Enhancement of the upper critical field in disordered transition metal dichalcogenide monolayers
• Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
• Threefold enhancement of superconductivity and the role of field-induced odd-frequency pairing in epitaxial aluminum films near the 2D limit
• 2D superconductivity and vortex dynamics in 1T-MoS2
• Interlayer transport in highly anisotropic misfit-layer superconductor (LaSe)1.14(NbSe2)
• Quasiparticle $GW$ band structures and Fermi surfaces of bulk and monolayer NbS${}_2$
• Impurity-pinned incommensurate charge density wave and local phonon excitations in 2H-NbS2
• In-plane magnetic penetration depth in NbS${}_2$
• Transition from three- to two-dimensional Ising superconductivity in few-layer NbSe2 by proximity effect from van der Waals heterostacking
• Probing the interlayer coupling in 2$H$-NbS${}_2$ via soft x-ray angle-resolved photoemission spectroscopy
• A statistical model for the intrinsically broad superconducting to normal transition in quasi-two-dimensional crystalline organic metals
• Evidence for Pauli-limiting behaviour at high fields and enhanced upper critical fields near T_c in several disordered FeAs based Superconductors

Cited by in corpus (2)

• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in 2H-NbS2 flakes
• The Anisotropy of Thermal Activation Energy of 2H-NbS${}_2$