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arXiv · 1105.1405

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

Satoshi Kashiwaya·Hiromi Kashiwaya·Hiroshi Kambara·Tsuyoshi Furuta·Hiroshi Yaguchi·Yukio Tanaka·Yoshiteru Maeno
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Abstract

We perform tunneling spectroscopy of Sr$_2$RuO$_4$ searching for the edge states peculiar to topological superconductivity. Conductance spectra obtained on Sr$_2$RuO$_4$/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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Satoshi Kashiwaya, Hiromi Kashiwaya, Hiroshi Kambara, Tsuyoshi Furuta, Hiroshi Yaguchi, Yukio Tanaka, Yoshiteru Maeno. 2011-05-07. Edge states of Sr$_2$RuO$_4$ detected by in-plane tunneling spectroscopy. https://doi.org/10.1103/physrevlett.107.077003

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