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

Kazuhiko Deguchi; Makariy Tanatar; Zhiqiang Mao; Takehiko Ishiguro; Yoshiteru Maeno

doi:10.1143/jpsj.71.2839

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

Kazuhiko Deguchi·Makariy Tanatar·Zhiqiang Mao·Takehiko Ishiguro·Yoshiteru Maeno

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Abstract

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 degrees. 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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Kazuhiko Deguchi, Makariy Tanatar, Zhiqiang Mao, Takehiko Ishiguro, Yoshiteru Maeno. 2004-01-31. Superconducting Double Transition and the Upper Critical Field Limit of Sr2RuO4 in Parallel Magnetic Fields. https://doi.org/10.1143/jpsj.71.2839

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