Changes in the Superconducting State of Sr_2RuO_4 under Magnetic Fields Probed by Specific Heat : Condensed Matter: Electronic Properties, etc.
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概要
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We report the specific heat of a high-quality single crystal (T_c=1.48K) of the spin-triplet superconductor Sr_2RuO_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 1.2T. 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.
- 社団法人日本物理学会の論文
- 2000-02-15
著者
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MAENO Yoshiteru
Department of Physics, Graduate School of Science, Kyoto University
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Mao Zhiqiang
Department Of Physics Kyoto University:core Research For Evolutional Science And Technology Japan Sc
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Mao Zhiqiang
Department Of Physics Kyoto University Core Research For Evolutional Science And Technology Japan Sc
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Mao Zhiqiang
Department Of Physics Graduate School Of Science Kyoto Univ.:crest Japan Science And Technology Corp
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NISHIZAKI Shuji
Department of Physics,Hiroshima University
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Nishizaki Shuji
Department Of Physics Kyoto University
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Nishizaki Shuji
Department Of Physics Hiroshima University
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Maeno Yoshiteru
Department Of Physics Faculty Of Science Hiroshima University
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