Interface superconductivity in the eutectic Sr2RuO4Ru: 3-K phase of Sr2RuO4

Hiroshi Yaguchi, Masahiko Wada, Takashi Akima, Yoshiteru Maeno, and Takehiko Ishiguro
Phys. Rev. B 67, 214519 – Published 24 June 2003
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Abstract

Enhanced superconductivity in the eutectic system Sr2RuO4Ru is referred to as the 3-K phase of the spin-triplet superconductor Sr2RuO4 because of its enhanced superconducting transition temperature Tc of 3K. We have investigated the field-temperature (HT) phase diagram of the 3-K phase for fields parallel and perpendicular to the ab plane of Sr2RuO4, using out-of-plane resistivity measurements. We have found an upturn curvature in the Hc2(T) curve for Hc, and a rather gradual temperature dependence of Hc2 close to Tc for both Hab and Hc. We have also investigated the dependence of Hc2 on the angle between the field and the ab plane at several temperatures. Fitting the Ginzburg-Landau effective-mass model apparently fails to reproduce the angle dependence, particularly near Hc and at low temperatures. We propose that all of these characteristic features can be explained, at least in a qualitative fashion, on the basis of a theory by Sigrist and Monien that assumes surface superconductivity with a two-component order parameter occurring at the interface between Sr2RuO4 and Ru inclusions. This provides evidence of the chiral state postulated for the 1.5-K phase by several experiments.

  • Received 31 July 2002

DOI:https://doi.org/10.1103/PhysRevB.67.214519

©2003 American Physical Society

Authors & Affiliations

Hiroshi Yaguchi

  • Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan

Masahiko Wada and Takashi Akima

  • Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan

Yoshiteru Maeno

  • Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan;
  • CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan;
  • Kyoto University International Innovation Center, Kyoto 606-8501, Japan

Takehiko Ishiguro

  • Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan

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Vol. 67, Iss. 21 — 1 June 2003

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