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Article Dans Une Revue Physical Review B Année : 2023

Protection of Ising spin-orbit coupling in bulk misfit superconductors

Darshana Wickramaratne
Thomas Jaouen
Dominik Volavka
Marek Kuzmiak
Jozef Haniš
Claude Monney
Patrick Le Fèvre
François Bertran
Tristan Cren
Laurent Cario
Peter Samuely

Résumé

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 (NbSe 2) and (LaSe) 1.14 (NbSe 2) 2 , comprising monolayers and bilayers of NbSe 2 , exhibit unexpectedly strong Ising protection with a Pauli-limit violation comparable to monolayer NbSe 2. 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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Licence : CC BY - Paternité

Dates et versions

hal-04325007 , version 1 (11-04-2023)
hal-04325007 , version 2 (05-12-2023)

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Tomáš Samuely, Darshana Wickramaratne, Martin Gmitra, Thomas Jaouen, Ondrej Šofranko, et al.. Protection of Ising spin-orbit coupling in bulk misfit superconductors. Physical Review B, 2023, 108 (22), pp.L220501. ⟨10.1103/physrevb.108.l220501⟩. ⟨hal-04325007v2⟩
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