Two types of charge order with distinct interplay with superconductivity in the kagome material CsV3Sb5

The kagome metals of the family AV₃Sb₅ exhibit intriguing phenomena like chiral charge order and superconductivity. CsV₃Sb₅ displays a double superconducting dome where charge order persists. This study combines high-pressure, low-temperature muon spin relaxation/rotation with first-principles calculations to investigate this behavior. A threefold enhancement of the superfluid density with a double-peak feature is observed, mirroring the superconducting critical temperature. Three distinct regions in the phase diagram are identified, each with unique slopes in the superfluid density-critical temperature relationship. This suggests an evolution of the charge order pattern from a superimposed tri-hexagonal Star-of-David phase at low pressures to a staggered tri-hexagonal phase at intermediate pressures, indicating varying competition with superconductivity.

Ritu Gupta, Debarchan Das, Charles Mielke III, Ethan T. Ritz, Fabian Hotz, Qiangwei Yin, Zhijun Tu, Chunsheng Gong, Hechang Lei, Turan Birol, Rafael M. Fernandes, Zurab Guguchia, Hubertus Luetkens, Rustem Khasanov