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

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.

4 pages, 4 figures

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• Determination of the Superconducting Gap Structure in All Bands of the Spin-Triplet Superconductor Sr2RuO4
• Ultrasound evidence for a two-component superconducting order parameter in Sr${}_2$RuO${}_4$
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• Superconducting pairing in Sr${}_2$RuO${}_4$ from weak to intermediate coupling
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• Theory of Transport Properties in the p-wave Superconducting State of Sr2RuO4 - A Microscopic Determination of the Gap Structure -
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• Quasi-classical determination of the in-plane magnetic field phase diagram of superconducting Sr_2RuO_4
• Leggett modes and multi-band superconductivity in Sr2RuO4
• Sr_2 Ru O_4 : Broken Time-Reversal Symmetry in the Superconducting state
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• Fingerprints of possible even-parity superconducting states in Sr${}_2$RuO${}_4$ detected by planar tunneling spectroscopy
• Magnetic field orientation effect on specific heat in a p-wave superconductor