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

Abstract

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.

References in corpus (6)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Chiral P-Wave Order in Sr_2RuO_4
• First-Order Superconducting Transition of Sr2RuO4
• Vortex coalescence and type-1.5 superconductivity in Sr2RuO4
• Fractional vortex lattice structures in spin triplet superconductors
• Vortex Structures in Model p-Wave Superconducting Sr2RuO4 -- Single 2-Dimensional Band v.s. Quasi-1-Dimensional Band

Cited by in corpus (9)

• Pairing symmetry and dominant band in Sr2RuO4
• Theory of chiral $p$-wave superconductivity with near-nodes for Sr${}_2$RuO${}_4$
• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Anomalous vortex dynamics in spin-triplet superconductor UTe${}_2$
• Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor Sr${}_2$RuO${}_4$
• Robust and tunable coreless vortices and fractional vortices in chiral $d$-wave superconductors
• Observation of Persistent Zero Modes and Superconducting Vortex Doublets in UTe${}_2$
• Spin-polarized local density of states in the vortex state of helical p-wave superconductors
• Chiral superconductivity in nematic states