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Ising Superconductivity and Magnetism in NbSe<sub>2</sub>

ORAL

Abstract

We use density-functional theory (DFT) calculations to quantitatively address the superconducting properties of bulk and monolayer NbSe2 [1]. We demonstrate that NbSe2 is close to a ferromagnetic instability, and analyze our results in the context of experimental measurements of the spin susceptibility in NbSe2. We show how this magnetic instability, which is pronounced in a single monolayer, can enable sizable singlet-triplet mixing of the superconducting order parameter, contrary to contemporary considerations of the pairing symmetry in monolayer NbSe2, Our calculations also enable a quantitative description of the large anisotropy of the superconducting critical field, using DFT calculations of monolayer NbSe2 in the normal state.

[1] D.Wickramaratne, S. Khmelevskyi, D.F. Agterberg, and I. I. Mazin, Phys. Rev. X 10, 041003 (2020).

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Presenters

  • Daniel Agterberg

    University of Wisconsin - Milwaukee, Department of Physics, University of Wisconsin, Milwaukee

Authors

  • Darshana Wickramaratne

    United States Naval Research Laboratory, Center for Computational Materials Science, US Naval Research Laboratory

  • Sergii Khmelevskyi

    Vienna Univ of Technology

  • Daniel Agterberg

    University of Wisconsin - Milwaukee, Department of Physics, University of Wisconsin, Milwaukee

  • Igor Mazin

    Physics & Astronomy, George Mason University, Department of Physics and Astronomy, George Mason University, George Mason University, Physics and Astronomy, George Mason University, Physics, George Mason University, Department of Physics and Astronomy,, George Mason University, Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University – Fairfax, VA, USA