Non-equilibrium spin transport in Zeeman-split superconductors

Abstract

We investigate theoretically the non-local conductance through a superconducting wire in tunnel contact with normal and ferromagnetic leads. In the presence of an in-plane magnetic field, the superconducting density of states is spin-split, and the current injected from the normal lead is spin-polarized. A non-local conductance that is antisymmetric with the applied voltage can be measured with a ferromagnetic lead. It persists for a distance between the contacts that is larger than both the charge-imbalance relaxation length and the normal-state spin relaxation length. We determine its amplitude by considering two extreme models of weak and strong internal equilibration of the superconducting quasiparticles due to electron-electron interactions. We find that the non-local signal, which was measured in recent experiments and discussed as a spin-imbalance effect, can be interpreted alternatively as the signature of a thermoelectric effect.

arXiv comment5 pages, 3 figures

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• Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
• Quasiparticle Spin Resonance and Coherence in Superconducting Aluminium
• Voltage-induced thin-film superconductivity in high magnetic fields
• Injection of nonequilibrium quasiparticles into Zeeman-split superconductors: a way to create long-range spin imbalance
• Flux flow spin Hall effect in type-II superconductors with spin-splitting field
• Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures
• Thermospin effects in superconducting heterostructures
• Superconductivity provides a giant enhancement to the spin battery effect
• Stimulated quasiparticles in spin-split superconductors
• Spin currents driven by the Higgs mode in magnetic superconductors
• Out-of-Equilibrium Spin Transport in Mesoscopic Superconductors
• Superconductor spintronics: Modeling spin and charge accumulation in out-of-equilibrium NS junctions subjected to Zeeman magnetic fields
• Spin-polarized quasiparticle control in a double spin-filter tunnel junction
• Spin-dependent coupling of supercurrent and nonequilibrium quasiparticles in high-field superconductors
• Magnetic exchange interaction in spin-valve with chiral spin-triplet superconductor
• Spin transport in a normal meta-altermagnetic superconducting nanowire junction