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TT: Fachverband Tiefe Temperaturen

TT 80: Correlated Electrons: Poster

TT 80.38: Poster

Donnerstag, 21. März 2024, 15:00–18:00, Poster E

High-pressure study of CDW in 2H-TaSe₂ — •Yuliia Tymoshenko¹, Amir-Abbas Haghighirad¹, Tom Lacmann¹, Alsu Ivashko¹, Gaston Garbarino², Luigi Paolasini², and Frank Weber¹ — ¹Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany — ²European Synchrotron Radiation Facility, 71 avenue des Martyrs, CS 40220, Grenoble 38043, France

The study of charge density wave (CDW) materials is one of the most intriguing areas of modern solid state physics, since CDW often appears close to superconductivity (SC). The relationship between these phenomena, whether it be cooperation, competition, or simply coexistence, has been a subject of long-standing controversy. 2H-TaSe₂, a prototypical transition metal dichalcogenide (TMD) in which CDW and SC are intertwined, serves as a promising material to shed light on the interplay of both cooperative electron phenomena. Here we present our recent high-pressure x-ray diffraction (XRD) and spectroscopy (IXS) measurements showing a full suppression of the CDW by pressure, revealing a quantum critical point (QCP). The data shows a close connection between the QCP and the emegnent superconducting phase.

Keywords: high pressure; charge density wave; xrd; ixs; phonons