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We perform tunneling spectroscopy of Sr$_2$RuO$_4$ searching for the edgestates peculiar to topological superconductivity. Conductance spectra obtainedon Sr$_2$RuO$_4$/Au junctions fabricated using $in$ $situ$ process show broadhumps indicating the successful detection of a-axis edge of 1.5K phase. Threetypes of peak shape are detected: domelike peak, split peak and two-step peak.By comparing the experiments with predictions for unconventionalsuperconductivity, these varieties are shown to originate from multiband chiralp-wave symmetry with weak anisotropy of pair amplitude. The broad hump inconductance spectrum is a direct manifestation of the edge state peculiar tothe chiral p-wave superconductivity.

Edge states of Sr$_2$RuO$_4$ detected by in-plane tunneling spectroscopy