Spin-Triplet Pairing State of Sr

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概要

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• We investigate the spin-triplet superconducting state of Sr<inf>2</inf>RuO<inf>4</inf>in the magnetic field along the c-axis on the basis of the four-component Ginzburg--Landau (GL) model with a weak spin--orbit coupling. We consider superconducting states described by the d-vector parallel to the ab-plane (\mbi{d}\parallel ab), and find that three spin-triplet pairing states are stabilized in the magnetic field--temperature (H--T) phase diagram. Although a helical state is stable at low magnetic fields, a chiral II state is stabilized at high magnetic fields. A non-unitary spin-triplet pairing state appears near the transition temperature owing to the coupling of magnetic field and chirality. We elucidate synergistic and/or competing roles of the magnetic field, chirality, and spin--orbit coupling. It is shown that a fractional vortex lattice is stabilized in the chiral II phase owing to the spin--orbit coupling.

• 2013-06-15

著者

• Yanase Youichi

  Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan

• Takamatsu Shuhei

  Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan

関連論文

• Spin--Orbit Coupling in Multilayer Superconductors with Charge Imbalance
• Spin Susceptibility in Non-Centrosymmetric Superconductors with Topological Transition of Fermi Surfaces
• Spin-Triplet Pairing State of Sr
• Multi-Orbital Superconductivity in SrTiO

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