Formation of non-unitary state near the upper-critical field of Sr${}_2$RuO${}_4$

Abstract

We have studied the superconducting state of Sr${}_2$RuO${}_4$ under a magnetic field parallel to the superconducting plane. We show that due to a weak spin-orbit coupling, non-unitary k${}_y(\hat{\mathbf{z}}-i\alpha \hat{\mathbf{y}})$ state is formed right at H${}_{c2}$, then changes to unitary k${}_y\hat{\mathbf{z}}$ state, as a magnetic field is lowered. In terms of this crossover, we address the origin of the observed double peaks of specific heat and the disappearance of the double peaks at low fields.

arXiv comment8 pages, 3 figures. to appear in J. Phys. Soc. Jpn

References in corpus (6)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• Gap Structure of the Spin-Triplet Superconductor Sr2RuO4 Determined from the Field-Orientation Dependence of Specific Heat
• Vortex lattice structures of Sr${}_2$RuO${}_4$
• Roles of Electron Correlations in the Spin-Triplet Superconductivity of Sr2RuO4
• Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4
• Superconducting Double Transition and the Upper Critical Field Limit of Sr2RuO4 in Parallel Magnetic Fields

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• Parity-Mixed Superconductivity in Locally Non-centrosymmetric System
• Random Spin-orbit Coupling in Spin Triplet Superconductors: Stacking Faults in Sr_2RuO_4 and CePt_3Si
• Spin-Triplet Pairing State of Sr2RuO4 in the c-Axis Magnetic Field
• Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor Sr${}_2$RuO${}_4$
• Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O II: Multiple phase diagram under the magnetic field
• Identification of Spin-Triplet Superconductivity through a Helical-Chiral Phase Transition in Sr${}_2$RuO${}_4$ Thin-Films
• Quenched metastable vortex states in Sr2RuO4
• High-resolution magnetostriction measurements of the Pauli-limited superconductor Sr2RuO4