Anomalous Metallic State Driven by Magnetic Field at the LaAlO3/KTaO3 (111) Interface

Abstract

The origin of the quantum superconductor to metal transition at zero temperature in two-dimensional superconductors is still an open problem, which has caused intensely discussion. Here, we report the observation of a quantum superconductor-to-metal transition in LaAlO3/KTaO3 (111) interface, driven by magnetic field. When a small magnetic field perpendicular to the film plane is applied, the residual saturated resistance is observed, indicating the emergence of an anomalous metallic state associated with a failed superconductor. The dependence of saturated resistance on magnetic field at low temperature indicates that the observed metal state is a Bose metal state. From our findings, magnetic field regulating LaAlO3/KTaO3 (111) interface emerges as a platform to scrutinize the details of the anomalous metallic state in a controllable way.