Tunable unconventional kagome superconductivity in charge ordered RbV₃Sb₅ and KV₃Sb₅.

ABSTRACT: Unconventional superconductors often feature competing orders, small superfluid density, and nodal electronic pairing. While unusual superconductivity has been proposed in the kagome metals AV₃Sb₅, key spectroscopic evidence has remained elusive. Here we utilize pressure-tuned and ultra-low temperature muon spin spectroscopy to uncover the unconventional nature of superconductivity in RbV₃Sb₅ and KV₃Sb₅. At ambient pressure, we observed time-reversal symmetry breaking charge order below [Formula: see text] 110 K in RbV₃Sb₅ with an additional transition at [Formula: see text] 50 K. Remarkably, the superconducting state displays a nodal energy gap and a reduced superfluid density, which can be attributed

SUBMITTER: Guguchia Z 

PROVIDER: S-EPMC9834244 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature