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TT: Fachverband Tiefe Temperaturen

TT 21: Focus Session: Topological Kagome Metals

TT 21.3: Vortrag

Donnerstag, 30. September 2021, 14:30–15:00, H7

Kagome and non-kagome physics of AV₃Sb₅ — •Alexander A. Tsirlin — EP VI, EKM, University of Augsburg, Germany

Layered compounds AV₃Sb₅ (A = K, Rb, Cs) are non-magnetic kagome metals with an intricate coexistence of and competition between superconducting and charge-density-wave (CDW) instabilities. In this talk, I will present our recent study of these compounds via x-ray diffraction, density-functional calculations, and broadband optical spectroscopy, with a focus on delineating between the roles of vanadium kagome planes and Sb atoms that encompass these planes. The following aspects will be addressed: i) band saddle points in the vicinity of the Fermi level and their positions depending on the A atom; ii) possible structures of the CDW state; iii) electronic and structural mechanisms of stabilizing the CDW; iv) evolution of crystal and electronic structures under pressure where re-entrant superconductivity has been observed. I will argue that both CDW formation in and pressure evolution of AV₃Sb₅ are strongly influenced by the Sb atoms that should be deemed an integral part of these kagome metals.