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Quasiparticle-mediated spin Hall effect in a superconductor.

T Wakamura¹, H Akaike², Y Omori¹

¹Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.

Nature Materials

|May 19, 2015

Summary

Researchers observed a massive enhancement of the inverse spin Hall effect in a superconductor (NbN) below its critical temperature. This quasiparticle-mediated effect, crucial for spintronics, increased over 2,000 times compared to the normal state.

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Area of Science:

Condensed Matter Physics
Materials Science
Spintronics

Background:

The interplay between superconductivity and magnetism leads to unique phenomena like coexistence and spin-triplet supercurrents.
Superconductors show potential in spintronics, evidenced by spin-charge separation observations, but research is limited.
The inverse spin Hall (ISH) effect is a key spintronic phenomenon converting charge currents into spin currents.

Purpose of the Study:

To experimentally investigate the quasiparticle-mediated spin Hall effect in a superconductor.
To explore the potential of superconductors in spintronic applications by studying the ISH effect.

Main Methods:

Experimental observation of the inverse spin Hall (ISH) effect in Niobium Nitride (NbN) superconductor.
Measurements were conducted below the superconducting transition temperature.
Varying injected spin current and probe distances to analyze the ISH signal characteristics.

Main Results:

The ISH effect was observed in NbN even below its superconducting transition temperature.
A surprising increase of over 2,000 times in the ISH signal was recorded compared to the normal state.
The enhanced ISH signal diminished when probe distances exceeded the charge imbalance length, confirming quasiparticle mediation.

Conclusions:

Superconductors, specifically NbN, exhibit a significantly enhanced quasiparticle-mediated inverse spin Hall effect below the critical temperature.
This finding highlights the potential of superconductors for advanced spintronic devices.
The observed phenomenon is strongly linked to quasiparticle dynamics within the superconductor.