Authors: Zheyu Wang, Lingfei Wang, King Yau Yip, Ying Kit Tsui, Tsz Fung Poon, Wenyan Wang, Chun Wai Tsang, Shanmin Wang, David Graf, Alexandre Pourret, Gabriel Seyfarth, Georg Knebel, Kwing To Lai, Wing Chi Yu, Wei Zhang, Swee K. Goh
Published: 2025-03-12
Source: Full article
AbstractResults of magnetotransport measurements are reported on KV3Sb5 thin flakes under pressure. The zero‐field electrical resistance reveals an additional anomaly emerging under pressure (p), marking a previously unidentified phase boundary T*(p). Together with the established TCDW(p) and Tc(p), denoting the charge‐density‐wave transition and a superconducting transition, respectively, the temperature‐pressure phase diagram of KV3Sb5 features a rich interplay among multiple phases. The Hall coefficient evolves reasonably smoothly when crossing the T* phase boundary compared with the variation when crossing TCDW, indicating the preservation of the pristine electronic structure. The mobility spectrum analysis provides further insights into distinguishing different phases. Finally, the high‐pressure quantum oscillation studies up to 31 T combined with the 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.