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TT: Fachverband Tiefe Temperaturen
TT 54: Correlated Electrons: Charge Order
TT 54.6: Vortrag
Freitag, 21. März 2025, 10:45–11:00, H33
Resistance of Vapor-Grown NbSe2 Single Crystals under Strain — •Maik Golombiewski, Tianyi Xu, Simon Knudsen, Michael Paul, Sven Graus, Teslin R. Thomas, Andreas Kreyssig, and Anna E. Böhmer — Experimentalphysik IV, Ruhr-Universität Bochum, 44801 Bochum, Germany
NbSe2 shows a charge density wave (CDW) transition upon cooling below TCDW = 32 K and becomes superconducting at Tc = 7.2 K. Large NbSe2 single crystals were grown via chemical vapor transport with iodine as transport agent. Growth conditions, such as temperature gradient, were optimized resulting in an increase in RRR. Samples were shown to have a 1:2 stoichiometry via energy-dispersive x-ray spectroscopy and the 2H-structure was confirmed by powder x-ray diffraction measurements. Temperature-dependent resistance was measured while simultaneously straining the samples using cryogenic strain and force cells. This so-called elastoresistance exhibits a minimum around TCDW. Using the force cell, large strains were applied and investigated.
We acknowledge support by the Mercator Research Center Ruhr
(MERCUR), under project number Ko-2021-0027.
Keywords: NbSe2; Chemical Vapor Transport; Charge Density Wave; Superconductivity; FeSe