Signatures of spin-polarized p-wave superconductivity in the kagome material RbV₃Sb₅

The study of kagome materials has attracted much attention due to the presence of many electron-electron interaction-driven phases in a single material. In this work, we report the discovery of intrinsic spin-polarized p-wave superconductivity in the thin-flake kagome material RbV₃Sb₅. A hysteresis in resistance as a function of the applied in-plane magnetic field is observed, indicating the emergence of an intrinsic time-reversal symmetry-breaking superconducting phase. Interestingly, a finite resistance state can be quenched to a zero-resistance state by applying a large current within the hysteresis loop. Moreover, a magnetic field-driven re-entrance of superconductivity is also observed. We suggest that the pairing symmetry, which is consistent with the crystal symmetry and the observed novel properties, is a time-reversal symmetry-breaking, p-wave pairing state with net spin polarization.

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