Electron-phonon interaction, magnetic phase transition, charge density waves, and resistive switching in VS2 and VSe2 revealed by Yanson point-contact spectroscopy

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • D. L. Bashlakov - , NASU - B. Verkin Institute for Low Temperature Physics and Engineering (Author)
  • O. E. Kvitnitskaya - , NASU - B. Verkin Institute for Low Temperature Physics and Engineering, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • S. Aswartham - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • G. Shipunov - , Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • L. Harnagea - , Indian Institute of Science Education and Research Pune (Author)
  • D. V. Efremov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • B. Büchner - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Experimental Solid State Physics, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Yu G. Naidyuk - , NASU - B. Verkin Institute for Low Temperature Physics and Engineering (Author)

Abstract

VS2 and VSe2 have attracted particular attention among the transition metals dichalcogenides because of their promising physical properties concerning magnetic ordering, charge density wave (CDW), emergent superconductivity, etc., which are very sensitive to stoichiometry and dimensionality reduction. Yanson point-contact (PC) spectroscopic study reveals metallic and nonmetallic states in VS2 PCs, as well as a magnetic phase transition, was detected near 20 K. The rare PC spectra, where the magnetic phase transition was not visible, show a broad maximum of around 20 mV, likely connected with electron-phonon interaction (EPI). The PC spectra of VSe2 demonstrate metallic behavior, which allowed us to detect features associated with EPI and CDW transition. The Kondo effect appeared for both compounds, apparently due to interlayer vanadium ions. Besides, the resistive switching was observed in PCs on VSe2 between a low resistive, mainly metallic-type state, and a high resistive nonmetallic-type state by applying bias voltage (about 0.4 V). Reverse switching occurs by applying a voltage of opposite polarity (about 0.4 V). The reason may be the alteration of stoichiometry in the PC core due to the displacement of V ions to interlayer under a high electric field. The observed resistive switching characterizes VSe2 as a potential material, e.g., for non-volatile resistive RAM, neuromorphic engineering, and other nanoelectronic applications. Per contra, VS2 attracts attention as a rare layered van der Waals compound with magnetic transition.

Details

Original languageEnglish
Pages (from-to)676-682
Number of pages7
JournalLow Temperature Physics
Volume50
Issue number8
Publication statusPublished - 1 Aug 2024
Peer-reviewedYes

Keywords

ASJC Scopus subject areas

Keywords

  • charge density waves, electron-phonon interaction, resistive switching., transition metal dichalcogenides, VS, VSe, Yanson point-contact spectroscopy