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Gap Structure of the Spin-Triplet Superconductor Sr2RuO4 Determined from the Field-Orientation Dependence of Specific Heat

Kazuhiko Deguchi·Zhiqiang Mao·Hiroshi Yaguchi·Yoshiteru Maeno
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Abstract

We report the field-orientation dependent specific heat of the spin-triplet superconductor Sr2RuO4 under the magnetic field aligned parallel to the RuO2 planes with high accuracy. Below about 0.3 K, striking 4-fold oscillations of the density of states reflecting the superconducting gap structure have been resolved for the first time. We also obtained strong evidence of multi-band superconductivity and concluded that the superconducting gap in the active band, responsible for the superconducting instability, is modulated with a minimum along the [100] direction.

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Kazuhiko Deguchi, Zhiqiang Mao, Hiroshi Yaguchi, Yoshiteru Maeno. 2004-01-30. Gap Structure of the Spin-Triplet Superconductor Sr2RuO4 Determined from the Field-Orientation Dependence of Specific Heat. https://doi.org/10.1103/physrevlett.92.047002

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