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

Kazuhiko Deguchi, Makariy A. Tanatar, Zhiqiang Mao, Takehiko Ishiguro, Yoshiteru Maeno

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66 Scopus citations


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 H c2 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.

Original languageEnglish (US)
Pages (from-to)2839-2842
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number12
StatePublished - Dec 1 2002

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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