Tuesday, May 21, 2013

1305.4494 (Shuhei Takamatsu et al.)

Spin-Triplet Pairing State of Sr2RuO4 in the c-Axis Magnetic Field    [PDF]

Shuhei Takamatsu, Youichi Yanase
We investigate the spin-triplet superconducting state of Sr2RuO4 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, and find that three spin-triplet pairing states are stabilized in the magnetic field-temperature 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.
View original: http://arxiv.org/abs/1305.4494

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