Mechanisms of the in-plane magnetic anisotropy in superconducting NbSe2

Abstract

We present a unifying picture of the magnetic in-plane anisotropies of two-dimensional superconductors based on transition metal dichalcogenides. The symmetry considerations are first applied to constrain the form of the conductivity tensor. We hence conclude that the two-fold periodicity of transport distinct from the planar Hall related contributions requires a tensor perturbation. At the same time, the six-fold periodic variation of the critical field results from the Rashba spin-orbit coupling on a hexagonal lattice. We have considered the effect of a weak tensor perturbation on the critical field, gap function, and magneto-conductivity. The latter is studied using the time-dependent Ginzburg-Landau phenomenology. The common origin of the two-fold anisotropy in transport and thermodynamics properties is identified. The scheme constructed here is applied to describe the existing theoretical scenarios from a unified point of view. This allows us to single out the differences and similarities between the suggested approaches.

arXiv comment12 pages, 6 figures

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• Weak-Coupling Theory of Pair Density-Wave Instabilities in Transition Metal Dichalcogenides
• Superconducting Diode Effect in Multiphase Superconductors
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• Friedel oscillations and chiral superconductivity in monolayer NbSe${}_2$
• Two-Fold Anisotropic Superconductivity in Bilayer T${}_d$-MoTe${}_2$
• Superconducting diode effect in Ising superconductors
• Planar Hall effect from superconducting fluctuations
• Interplay of magnetic field and magnetic impurities in Ising superconductors
• Pair-mixing induced Time-reversal-breaking superconductivity