Tunneling Properties at the Interface between Superconducting Sr_2RuO_4 and a Ru Microinclusion(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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We have investigated the magnetic field and temperature dependence of the tunneling spectra of the eutectic system Sr_2RuO_4-Ru. Electric contacts to individual Ru lamellae embedded in Sr_2RuO_4 enable the tunneling spectra at the interface between ruthenate and a Ru microinclusion to be measured. A zero bias conductance peak (ZBCP) was observed in the bias voltage dependence of the differential conductance, suggesting that Andreev bound states are present at the interface. The ZBCP starts to appear at a temperature well below the superconducting transition temperature. The onset magnetic field of the ZBCP is also considerably smaller than the upper critical field when the magnetic field is parallel to the ab-plane. We propose that the difference between the onset of the ZBCP and the onset of superconductivity can be understood in terms of the existence of the single-component state predicted by Sigrist and Monien.
社団法人日本物理学会の論文
2005-02-15