Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 69, Issue 2, Pages 572-578Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.69.572
Keywords
Sr2RuO4; ruthenate; spin-triplet superconductivity; specific heat; orbital dependent superconductivity
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We report the specific heat nf a high-quality single crystal (T-c = 1.48 K) of the spin-triplet superconductor ST2RUO4 under magnetic fields precisely parallel to the basal plane, The field-sweep measurements at low temperatures have revealed the existence of two distinct critical fields. We will argue that the dependence of the energy gap on different Fermi-surface sheets in combination with the in-plane anisotropy of the gap can explain such behavior. Furthermore, the temperature-sweep measurements have clearly revealed an unusual entropy release somewhat below T-c(H) only if the field is greater than 1.2T. This behavior corresponds well with the second-transition feature recently observed in the ac susceptibility measurements, and provides thermodynamic evidence for the change in the superconducting state.
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