Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 71, Issue 12, Pages 2839-2842Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.2839
Keywords
Sr(2)RiO(4); spin-triplet superconductivity; upper critical field; specific heat
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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 H-c2 for the field direction parallel to the RuO2 plane only within +/-2degrees. The limiting of H-c2 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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