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  • Letter

Protection of Ising spin-orbit coupling in bulk misfit superconductors

Tomas Samuely1,*, Darshana Wickramaratne2, Martin Gmitra1,3, Thomas Jaouen4, Ondrej Šofranko1, Dominik Volavka1, Marek Kuzmiak3, Jozef Haniš1, Pavol Szabó3 et al.

Claude Monney5, Geoffroy Kremer5,6, Patrick Le Fèvre7, François Bertran7, Tristan Cren8, Shunsuke Sasaki9, Laurent Cario9, Matteo Calandra10, Igor I. Mazin11,†, and Peter Samuely3

  • 1Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University in Košice, 04001 Košice, Slovakia
  • 2Center for Computational Materials Science, U.S. Naval Research Laboratory, Washington, DC 20375, USA
  • 3Centre of Low Temperature Physics, Institute of Experimental Physics, Slovak Academy of Sciences, 04001 Košice, Slovakia
  • 4Univ Rennes, CNRS, (IPR Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
  • 5Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, Fribourg CH-1700, Switzerland
  • 6Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, Campus ARTEM, 2 allée André Guinier, BP 50840, 54011 Nancy, France
  • 7SOLEIL synchrotron, L’Orme des Merisiers, Départementale 128, F-91190 Saint-Aubin, France
  • 8Institut des NanoSciences de Paris, Sorbonne Université and CNRS-UMR 7588, Paris 75005, France
  • 9Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France
  • 10Dipartimento di Fisica, Università di Trento, via Sommarive 14, I-38123 Povo, Italy
  • 11Department of Physics and Astronomy and Quantum Science and Engineering Center, George Mason University, Fairfax, Virginia 22030, USA

  • *tomas.samuely@upjs.sk
  • †imazin2@gmu.edu
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Phys. Rev. B 108, L220501 – Published 4 December, 2023

DOI: https://doi.org/10.1103/PhysRevB.108.L220501

Abstract

Ising superconductivity is present due to the combined effect of broken-inversion symmetry and spin-orbit coupling that locks the spins out of plane, features that are associated with two-dimensional materials. We show that bulk misfit superconductors, (LaSe)1.14(NbSe2) and (LaSe)1.14(NbSe2)2, comprising monolayers and bilayers of NbSe2, exhibit unexpectedly strong Ising protection with a Pauli-limit violation comparable to monolayer NbSe2. We establish these misfit compounds as Ising superconductors using complementary experimental methods in combination with first-principles calculations. A concerted effect of charge-transfer, defects, reduction of interlayer hopping, and stacking enables Ising superconductivity in these compounds and therefore provides a possible pathway to design of bulk superconductors that are resilient to magnetic fields.

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Phys. Rev. B 108, L220501– Published 4 December, 2023
  • Received 18 September 2023
  • Accepted 13 November 2023
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