Pressure-induced double superconducting domes and charge instability in the kagome metal KV3Sb5

Abstract

The kagome metal KV3Sb5 hosts charge order, topologically nontrivial Dirac band crossings, and a superconducting ground state with unconventional characteristics, providing an ideal platform to investigate the interplay between different electronic states on the kagome lattice. Here we study the evolution of charge order and superconductivity in KV3Sb5 under hydrostatic pressure using electrical resistivity measurements. With the application of pressure, the superconducting transition temperature Tc=0.9 K under ambient pressure quickly increases to 3.1 K at p=0.4 GPa, as charge order progressively weakens. Upon further increasing pressure, signatures of charge order disappear at pc1≈0.5 GPa and Tc is gradually suppressed, forming a superconducting dome that terminates at p≈10 GPa. Beyond p≈10 GPa, a second superconducting dome emerges with maximum Tc≈1.0 K at pc2≈22 GPa, which becomes fully suppressed at p≈28 GPa. The suppression of superconductivity for the second superconducting dome is associated with the appearance of a unique high-pressure phase, possibly a distinct charge order.

Source-reported materials — not catalogue approval

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