Spin currents and spontaneous magnetization at twin boundaries of noncentrosymmetric superconductors

Emiko Arahata; Titus Neupert; Manfred Sigrist

doi:10.1103/PhysRevB.87.220504

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Spin currents and spontaneous magnetization at twin boundaries of noncentrosymmetric superconductors

Emiko Arahata, Titus Neupert, Manfred Sigrist

DOI 10.1103/PhysRevB.87.220504 · Physical Review B

T1

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Abstract

Twin boundaries are generic crystalline defects in noncentrosymmetric crystal structures. We study theoretically twin boundaries in time-reversal-symmetric noncentrosymmetric superconductors that admit parity-mixed Cooper pairing. Twin boundaries support spin currents as a consequence of this parity mixing. If the singlet and triplet components of the superconducting order parameter are of comparable magnitude, the superconducting state breaks spontaneously the bulk time-reversal symmetry locally near the twin boundary. By self-consistently evaluating the Bogoliubov-de Gennes equations and the gap functions, we find two distinct phases: First, time-reversal-symmetry breaking enhances the spin currents but does not lead to charge current. A secondary phase transition then triggers a spin magnetization and a finite charge current near the twin boundary.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown