SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 57: Poster: Superconductivity I

TT 57.9: Poster

Donnerstag, 30. März 2023, 15:00–18:00, P2/OG2

Clarifying the origin of CDW and finding the routes to superconductivity in 1T-TiSe₂ — •Andrii Kuibarov¹, Alexander Fedorov^1,2, Rui Lou^1,2, Yuliia Shemerliuk¹, Oleksandr Suvorov¹, Saicharan Aswartham¹, Bastian Rubrecht¹, Dmitry Efremov¹, Helmuth Berger³, Bernd Büchner¹, and Sergey Borisenko¹ — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden — ²Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II — ³Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne

The relationship between charge density waves (CDW) and superconductivity was always one of the important questions of solid-state physics. Even though they are often observed on the phase diagram next to each other, it is still unknown whether CDW competes or cooperates with superconductivity. Utilizing the photon energy-dependent ARPES we investigate the 3D electronic structure of well-known CDW-bearing material TiSe₂, superconductor Cu_xTiSe₂, and TiSeS. Our results suggest that neither Mott nor the excitonic insulator model is applicable to the electronic structure of TiSe₂. In contrast to the generally accepted model, we find a crucial agreement with the conventional band structure calculations, which predict the absence of the energy gap in this material.

Additionally, we perform temperature-dependent ARPES studies and show that the CDW phase remains in doped superconducting samples Cu_xTiSe₂. On the basis of the obtained results, we propose a mechanism for both CDW and superconductivity TiSe₂ family.