Magnetic impurities in thin films and 2D Ising superconductors

Abstract

In the theory of dilute magnetic impurities in superconductors, the effect of all impurity spin-components is expressed via a single magnetic scattering rate ${\Gamma }_{\mathrm{m}}$. In a more realistic setting, magnetic impurities are anisotropic. In this case, the spatial randomness of three spin-components of impurities gives rise to generally different scattering rates ${\Gamma }_i$ ($i=1,2,3$). We explore the effects of anisotropic magnetic impurities on the in-plane critical field in 2D superconductors. We discuss singlet, triplet and parity-mixed order parameters allowed in systems without the inversion center. Also, the addition of a small amount of magnetic impurities may cause singlet to triplet crossovers. In all cases, different components of impurity spin affect the magnetic field -- temperature phase diagram differently. We show that anisotropy of the magnetic impurities can serve as a probe of unconventional triplet or parity-mixed superconductivity.

arXiv comment11 pages, 7 figures

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Cited by in corpus (8)

• Two scenarios for superconductivity in CeRh${}_2$As${}_2$
• Magnetic field-induced "mirage" gap in an Ising superconductor
• Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh${}_2$As${}_2$
• Magnetism-driven unconventional effects in Ising superconductors: role of proximity, tunneling, and nematicity
• Mechanisms of the in-plane magnetic anisotropy in superconducting NbSe2
• Signatures of triplet correlations in density of states of Ising superconductors
• Unconventional pairing in Ising superconductors: Application to monolayer NbSe${}_2$
• Interplay of magnetic field and magnetic impurities in Ising superconductors