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Impact of Sb degrees of freedom on the charge density wave phase diagram of the kagome metal CsV$ 3$Sb$ 5$ by Ritz, Ethan T.; Fernandes, Rafael M.; Birol, Turan is a scholarly article available to read on EtoBox.

What is Impact of Sb degrees of freedom on the charge density wave phase diagram of the kagome metal CsV$ 3$Sb$ 5$ about?

Elucidating the microscopic mechanisms responsible for the charge density wave (CDW) instability of the AV$_3$Sb$_5$ (A=Cs, K, Rb) family of kagome metals is critical for understanding their unique properties, including superconductivity. In these compounds, distinct CDW phases with wave-vectors at the $M$ and $L$ points are energetically favorable, opening the possibility of tuning the type of CDW order by appropriate external parameters. Here, we shed light on the CDW landscape of CsV$_3$Sb$_5$ via a combination of first-principles calculations and phenomenology, which consists of extracting the coefficients of the CDW Landau free-energy expansion from density functional theory. We find that while the main structural distortions of the kagome lattice in the staggered tri-hexagonal CDW phase are along the nearest-neighbor V-V bonds, distortions associated with the Sb ions play a defining role in the energy gain in this and all other CDW states. Moreover, the coupling between ionic displacements from different unit cells is small, thus explaining the existence of multiple CDW instabilities with different modulations along the c-axis. We also investigate how pressure and temperature

Author

Ritz, Ethan T.; Fernandes, Rafael M.; Birol, Turan

Published

2022

Language

EN