Superconductor-Metal Quantum Transition at the EuO/KTaO₃ Interface*

Abstract

We report the experimental investigation of the superconductor-metal quantum phase transition of the EuO/KTaO 3 interface. Around the transition, a divergence of the dynamical critical exponent is observed, which supports the quantum Griffiths singularity in the EuO/KTaO 3 interface. The quantum Griffiths singularity could be attributed to large rare superconducting regions and quenched disorders at the interface. Our results could pave the way for studying the exotic superconducting properties at the EuO/KTaO 3 interface.