Competition between charge-density-wave and superconductivity in the kagome metal RbV3Sb5

Abstract

The interplay between charge-density-wave (CDW) order and superconductivity (SC) in the kagome metal is studied by tracking the evolutions of their transition temperatures and as a function of pressure () via measurements of resistivity and magnetic susceptibility under various hydrostatic pressures up to ∼5 GPa. It is found that the CDW order at experiences a subtle modification at before it is completely suppressed around . Accordingly, the superconducting transition exhibits a shallow M-shaped double superconducting dome with two extrema of and 3.9 K around and , respectively, leading to a fourfold enhancement of with respect to that at ambient pressure. The constructed phase diagram of resembles that of and shares similar features to many other unconventional superconducting systems with intertwined competing electronic orders. The strong competition between CDW and SC is also evidenced by the broad superconducting transition width in the coexistent region. Our results shed more light on the intriguing physics involving intertwined electronic orders in this topological kagome metal family.