Spectroscopy of SrRuO/Ru Junctions in Eutectic
H. Yaguchi, K. Takizawa, M. Kawamura, N. Kikugawa, Y. Maeno, T. Meno,, T. Akazaki, K. Semba, H. Takayanagi
TL;DR
This study investigates the tunneling properties of Sr2RuO4/Ru interfaces in a eutectic system, revealing a zero bias conductance peak associated with surface superconductivity and proposing its use to identify phase boundaries of a time-reversal symmetry breaking state.
Contribution
The paper introduces a micro-fabrication method to create Sr2RuO4/Ru junctions in a eutectic system and links the ZBCP to surface superconductivity and phase boundary detection.
Findings
Observation of zero bias conductance peak in the 3-K phase.
Identification of the ZBCP as an indicator of surface superconductivity.
Proposal to use ZBCP onset for phase boundary delineation.
Abstract
We have investigated the tunnelling properties of the interface between superconducting Sr2RuO4 and a single Ru inclusion in eutectic. By using a micro-fabrication technique, we have made Sr2RuO4/Ru junctions on the eutectic system that consists of Sr2RuO4 and Ru micro-inclusions. Such a eutectic system exhibits surface superconductivity, called the 3-K phase. A zero bias conductance peak (ZBCP) was observed in the 3-K phase. We propose to use the onset of the ZBCP to delineate the phase boundary of a time-reversal symmetry breaking state.
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