Physics – Condensed Matter – Superconductivity
Scientific paper
2004-08-25
J. Phys. Soc. Jpn., Vol.74, No.2, p.531-534 (2005)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, to appear in J. Phys. Soc. Jpn. vol. 74 no. 2
Scientific paper
10.1143/JPSJ.74.531
We have investigated the magnetic field and temperature dependence of the tunneling spectra of the eutectic system Sr2RuO4-Ru. Electric contacts to individual Ru lamellae embedded in Sr2RuO4 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.
Kawamura Minoru
Kikugawa Naoki
Maeno Yasushi
Takayanagi Hideaki
Yaguchi Hiroshi
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