Superconducting Double Transition and the Upper Critical Field Limit of Sr<sub>2</sub>RuO<sub>4</sub>in Parallel Magnetic Fields

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  • Deguchi Kazuhiko
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502
  • Tanatar Makariy A.
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012
  • Mao Zhiqiang
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012
  • Ishiguro Takehiko
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012
  • Maeno Yoshiteru
    Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502 CREST, Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012 Kyoto University International Innovation Center, Kyoto 606-8501

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  • Superconducting Double Transition and the Upper Critical Field Limit of Sr2RuO4 in Parallel Magnetic Fields.

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We studied the specific heat and thermal conductivity of the spin-triplet superconductor Sr2RuO4 at low temperatures and under oriented magnetic fields H. We resolved a double peak structure of the superconducting transition under magnetic field for the first time, which provides thermodynamic evidence for the existence of multiple superconducting phases. We also found a clear limiting of the upper critical field Hc2 for the field direction parallel to the RuO2 plane only within ± 2°. The limiting of Hc2 occurs in the same H–T domain of the second superconducting phase; we suggest that the two phenomena have the same physical origin.

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