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TT: Fachverband Tiefe Temperaturen
TT 39: Correlated Electrons: Charge Order
TT 39.3: Talk
Wednesday, March 20, 2024, 10:00–10:15, H 3025
Elastoresistance of the charge-density-wave material NbSe2 — •Maik Golombiewski, Tianyi Xu, Simon Knudsen, Teslin R. Thomas, Sven Graus, Andreas Kreyssig, and Anna E. Böhmer — Lehrstuhl für Experimentalphysik IV, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum
Mono- and diselenides such as FeSe, FeSe2 and NbSe2 display many interesting and diverse properties. For example, FeSe is a well-known nematic superconductor, whereas NbSe2 exhibits superconductivity below Tc = 7.2 K and a charge-density-wave (CDW) phase below TCDW = 32 K. Optimizing growth parameters, we have grown large and homogeneous single crystals of FeSe, FeSe2 and NbSe2 via chemical vapor transport. Samples were characterized via x-ray diffraction, energy-dispersive x-ray spectroscopy and electrical resistance. In particular, we have determined the change of electrical resistance of NbSe2 under strain, i.e., its elastoresistance, around TCDW, using piezostacks and a cryogenic strain cell. A subtle anomaly in the linear elastoresistance at TCDW is observed. The effect of large elastic strains on the resistance will also be discussed.
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