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The understanding of the zero bias conductance peak (ZBCP) in the tunnellingspectra of S/N junctions involving d-wave cuprate superconductors has beenimportant in the determination of the phase structure of the superconductingorder parameter. In this context, the involvement of a p-wave superconductorsuch as Sr2RuO4 in tunnelling studies is indeed of great importance. We haverecently succeeded in fabricating devices that enable S/N junctions forming atinterfaces between Sr2RuO4 and Ru micro-inclusions in eutectic crystals to beinvestigated.3 We have observed a ZBCP and have interpreted it as due to theAndreev bound state, commonly seen in unconventional superconductors. Also wehave proposed that the onset of the ZBCP may be used to delineate the phaseboundary for the onset of a time reversal symmetry broken (TRSB) state withinthe superconducting state, which does not always coincide with the onset of thesuperconducting state. However, these measurements always involved twointerfaces between Sr2RuO4 and Ru. In the present study, we have extended theprevious measurements to obtain a deeper insight into the properties of asingle interface between Sr2RuO4 and Ru.Comment: To appear in J. Phys. Soc. Jpn. Vol. 75 No.12 issu

Tunnelling Spectroscopy of the Interface between Sr2RuO4 and a Single Ru Micro-Inclusion in Eutectic Crystals

Tunnelling Spectroscopy of the Interface between Sr₂RuO₄ and a Single Ru Micro-Inclusion in Eutectic Crystals