Discovery of a new phase in thin flakes of KV${}_3$Sb${}_5$ under pressure

Abstract

We report results of magnetotransport measurements on KV${}_3$Sb${}_5$ thin flakes under pressure. Our zero-field electrical resistance reveals an additional anomaly emerging under pressure ($p$), marking a previously unidentified phase boundary $T^{\ast }$($p$). Together with the established $T_{\mathrm{CDW}}(p)$ and $T_c(p)$, denoting the charge-density-wave transition and a superconducting transition, respectively, the temperature-pressure phase diagram of KV${}_3$Sb${}_5$ features a rich interplay among multiple phases. The Hall coefficient evolves reasonably smoothly when crossing the $T^{\ast }$ phase boundary compared with the variation when crossing $T_{\mathrm{CDW}}$, indicating the preservation of the pristine electronic structure. The mobility spectrum analysis provides further insights into distinguishing different phases. Finally, our high-pressure quantum oscillation studies up to 31 T combined with density functional theory calculations further demonstrate that the new phase does not reconstruct the Fermi surface, confirming that the translational symmetry of the pristine metallic state is preserved.

10 pages, 5 figures. Advanced Science (2025)

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• Role of On-site and Inter-site Coulomb Interactions in KV${}_3$Sb${}_5$: A first-principles DFT+$U$+$V$ study