Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Poster II
MA 46.28: Poster
Donnerstag, 21. März 2024, 15:00–18:00, Poster C
Electron-phonon interaction, magnetic phase transition, charge density waves and resistive switching in VS2 and VSe2 revealed by Yanson PCS — Dmytro Bashlakov1, •Oksana Kvitnitskaya2,1, Saicharan Aswartham2, Luminita Harnagea3, Dmitri Efremov2, Bernd Büchner2,4, and Yuri Naidyuk1 — 1B. Verkin Institute for Low Temperature Physics & Engineering, NASU, Kharkiv, Ukraine — 2Leibniz-Institute for Solid State Research, IFW Dresden, Dresden, Germany — 3Dep. of Physics, Indian Institute of Science Education and Research, Pune, India — 4Institute of Solid State and Materials Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, Dresden, Germany
The transition metals dichalcogenides VS2 and VSe2 possess promising properties as to magnetic and CDW ordering, emergent superconductivity, which are very sensitive to the stoichiometry and dimensionality. Yanson point-contact (PC) spectroscopic study reveals metallic and nonmetallic state in VS2 PCs, as well as magnetic phase transition below 25 K. PC spectra of VS2 testifies to the thermal regime, although the rare PC spectrum has a broad maximum at 20 mV due to electron-phonon interaction (EPI). PC spectra of VSe2 show metallic behavior with the features associated to EPI and CDW. The Kondo effect, which appeared for both compounds, is apparently due to interlayer V-ions. A resistive switching between a low-resistance metallic state and a high-resistance non-metallic state was observed in the PC on VSe2. The alteration of stoichiometry in PC core due to displacement of V-ions to interlayer under high electric field may be the reason.
Keywords: transition metals dichalcogenides; point contacts; switching effect; Kondo effect; charge density waves