Evolution of superconductivity and charge order in pressurized RbV3Sb5

The kagome metals AV(3)Sb(5) (A = K, Rb, Cs) under ambient pressure exhibit an unusual charge order, from which superconductivity emerges. In this work, by applying hydrostatic pressure using a liquid pressure medium and carrying out electrical resistance measurements for RbV3Sb5, we find that the charge order becomes suppressed under a modest pressure p (c) (1.4 GPa < p (c) < 1.6 GPa), while the superconducting transition temperature T (c) is maximized. T (c) is then gradually weakened with further increase of pressure and reaches a minimum around 14.3 GPa, before exhibiting another maximum around 22.8 GPa, signifying the presence of a second superconducting dome. Distinct normal state resistance anomalies are found to be associated with the second superconducting dome, similar to KV3Sb5. Our findings point to qualitatively similar temperature-pressure phase diagrams in KV3Sb5 and RbV3Sb5, and suggest a close link between the second superconducting dome and the high-pressure resistance anomalies.