Edge states of Sr2RuO4 detected by in-plane tunneling spectroscopy
Abstract
We perform tunneling spectroscopy of Sr2RuO4 searching for the edge states peculiar to topological superconductivity. Conductance spectra obtained on Sr2RuO4/Au junctions fabricated using in situ process show broad humps indicating the successful detection of a-axis edge of 1.5K phase. Three types of peak shape are detected: domelike peak, split peak and two-step peak. By comparing the experiments with predictions for unconventional superconductivity, these varieties are shown to originate from multiband chiral p-wave symmetry with weak anisotropy of pair amplitude. The broad hump in conductance spectrum is a direct manifestation of the edge state peculiar to the chiral p-wave superconductivity.
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