Giant nonreciprocal magnetotransport in bulk trigonal superconductor PbTaSe_{2}

Abstract

We report giant bulk rectification in the bulk trigonal superconductor PbTaSe_{2}. Nonreciprocal magnetotransport originating from a vortex ratchet motion was successfully observed, showing a significant enhancement during the superconducting transition, which is considered a model behavior for three-dimensional noncentrosymmetric superconductors with strong vortex pinning. Moreover, an unprecedented sign change of nonreciprocal transport was observed with increasing current, which indicates that the rectification effect can be tuned by the current value as well as the magnetic field. The present results represent the rich vortex dynamics and offer a principle for current control of rectification in noncentrosymmetric bulk superconductors.