Long-range spin imbalance in mesoscopic superconductors under a Zeeman splitting

Abstract

We develop a theory of spin relaxation in Zeeman-splitted superconducting films at low temperatures. A new mechanism of spin relaxation, specific only for Zeeman-splitted superconductors is proposed. It can explain the extremely high spin relaxation lengths, experimentally observed in Zeeman-splitted superconductors, and their strong growth with the magnetic field. In the framework of this mechanism the observed spin signal is formed by the spin-independent nonequilibrium quasiparticle distribution weighted by the spin-split DOS. We demonstrate that the relaxation length of such a spin signal is determined by the energy relaxation length at energies of the order of the superconducting gap.

arXiv comment6 pages, 2 figures, new references are added

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• Thermal, electric and spin transport in superconductor/ferromagnetic-insulator structures
• Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
• 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
• Nonlocal thermoelectric effects in high-field superconductor-ferromagnet hybrid structures
• Flux flow spin Hall effect in type-II superconductors with spin-splitting field
• Supercurrent Induced Charge-Spin Conversion in Spin-Split Superconductors
• Thermospin effects in superconducting heterostructures
• Superconductivity provides a giant enhancement to the spin battery effect
• Spin currents driven by the Higgs mode in magnetic superconductors
• Out-of-Equilibrium Spin Transport in Mesoscopic Superconductors
• Voltage control of superconducting exchange interaction and anomalous Josephson effect
• Superconductor spintronics: Modeling spin and charge accumulation in out-of-equilibrium NS junctions subjected to Zeeman magnetic fields
• RKKY interaction in a spin-split superconductor
• Spin-dependent coupling of supercurrent and nonequilibrium quasiparticles in high-field superconductors
• Quasiclassical theory of spin dynamics in superfluid ${}^3$He: kinetic equations in the bulk and spin response of surface Majorana states
• Spin transport in a normal meta-altermagnetic superconducting nanowire junction