Hall effect induced by a spin-polarized current in superconductors.

Area of Science:

• Condensed Matter Physics
• Superconductivity
• Spintronics

Background:

• The anomalous Hall effect (AHE) is a phenomenon observed in magnetic materials, but its investigation in superconductors (SC) is less explored.
• Understanding charge transport mechanisms in superconductors is crucial for developing novel electronic devices.
• Spin-polarized currents offer unique properties for manipulating electronic behavior in materials.

Purpose of the Study:

• To propose and theoretically investigate a novel anomalous Hall effect (AHE) in superconductors (SC) driven by spin-polarized currents.
• To elucidate the underlying physical mechanisms responsible for the transverse voltage generation in the superconducting state.
• To explore potential applications of this phenomenon, such as in the generation of the ac Josephson effect.

Main Methods:

• Theoretical modeling of spin-polarized quasiparticle transport in superconductors.
• Analysis of spin-orbit scattering effects on quasiparticles and Cooper pairs.
• Investigation of charge imbalance and transverse electric field generation.
• Examination of temperature dependence of Hall voltages arising from side jump and skew scattering mechanisms.

Main Results:

• A novel anomalous Hall effect is proposed, originating from spin-polarized currents in superconductors.
• Spin-orbit scattering deflects spin-polarized quasiparticles, creating a transverse charge imbalance that induces a Hall voltage.
• Distinct temperature dependencies for Hall voltages due to side jump and skew scattering mechanisms are identified in the superconducting state.

Conclusions:

• The study establishes a new mechanism for generating Hall voltage in superconductors via spin-polarized currents.
• The findings provide a deeper understanding of charge and spin dynamics in the superconducting state.
• A potential application is proposed: a spin-injection Hall device for generating the ac Josephson effect.