Vortex-mediated spin current injection into two-dimensional superconductor NbSe(2).

Vortices in NbSe2 enable efficient spin current injection, evidenced by a pronounced thermoelectric peak with an opposite sign near the upper critical magnetic field.

• Why it matters: Injecting pure spin current into superconductors is challenging, and understanding vortex involvement could unlock new pathways in superconducting spintronics, addressing a major knowledge gap.
• What they did: The study used an NbSe2 /LAFO bilayer under temperature gradients and magnetic fields, mapping the phase diagram to identify spin current injection occurring solely in the vortex liquid phase.
• The result: Vortices are demonstrated as effective carriers of spin information in superconductors, suggesting a new route for vortex-mediated superconducting spintronic devices.