Title: Changes in the Superconducting State of Sr<sub><b>2</b></sub>RuO<sub><b>4</b></sub>under Magnetic Fields Probed by Specific Heat
Abstract: We report the specific heat of a high-quality single crystal ( T c =1.48 K) of the spin-triplet superconductor Sr 2 RuO 4 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 1.2 T. 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.
Publication Year: 2000
Publication Date: 2000-02-15
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 222
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