From orbital to paramagnetic pair breaking in layered superconductor 2H-NbS_2
arxiv(2024)
摘要
The superconducting transition metal dichalcogenides 2H-NbSe_2 and
2H-NbS_2 are intensively studied on account of their unique electronic
properties such as Ising superconductivity, found in multi- and monolayers,
with upper critical fields beyond the Pauli limit. Even in bulk crystals, there
are reports of multiband superconductivity and exotic states, such as the
Fulde-Ferrell-Larkin-Ovchinnikov phase. In this work, we investigate the
superconducting properties of 2H-NbS_2 through a detailed high-field mapping
of the phase diagram by means of magnetotransport and magnetostriction
experiments. We compare the phase diagram between bulk crystals and a 6 nm
thick flake of 2H-NbS_2 and find a drastically enhanced Maki parameter in the
flake, signifying a change of the relevant pair breaking mechanism from orbital
to paramagnetic pair breaking, which we attribute to an effect of enhanced
spin-orbit coupling.
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