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MM: Fachverband Metall- und Materialphysik
MM 57: Phase Transformations III
MM 57.5: Vortrag
Donnerstag, 21. März 2024, 12:45–13:00, C 230
From orbital to paramagnetic pair breaking in layered superconductor 2H-NbS2 — Davide Pizzirani1,2, Thom Ottenbros1,2, Maró van Rijssel1,2, Oleksandr Zheliuk1,2, Yulia Kreminska3, Jasper Linnartz1,2, Malte Rösner2, Nigel Hussey1,2,4, Anne de Visser5, Jianting Ye3, Steffen Wiedmann1,2, and •Maarten van Delft1,2 — 1High Field Magnet Laboratory (HFML-EMFL), Radboud University, Nijmegen, Netherlands — 2Radboud University, Institute for Molecules and Materials, Nijmegen, Netherlands. — 3Device Physics of Complex Materials, Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands — 4H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom — 5Van der Waals-Zeeman Institute, University of Amsterdam, Amsterdam, The Netherlands
The transition metal dichalcogenide superconductors 2H-NbSe2 and 2H-NbS2 are intensively studied on account of their unique electronic properties, such as Ising superconductivity found in monolayers, with upper critical fields beyond the Pauli limit. However, interest in these materials is not limited to monolayers. Even in bulk crystals, there exist reports of multiband superconductivity and exotic states. Up to now, magnetotransport studies of these states in 2H-NbS2 are limited. Here, we report a detailed high-field mapping of the phase diagram of 2H-NbS2 by means of magnetotransport and magnetostriction. We compare bulk 2H-NbS2 and a 6 nm thick flake and find an enhanced Maki parameter in the flake, but with a reduced critical field, signifying a change of the relevant pair breaking mechanism.
Keywords: Superconductivity; Transition metal dichalcogenides; Pair breaking; Phase diagram