Others Quasiparticle-mediated spin Hall effect in a superconductor

Wakamura, T.  ,  Akaike, H.  ,  Omori, Y.  ,  Niimi, Y.  ,  Takahashi, S.  ,  Fujimaki, A.  ,  Maekawa, S.  ,  Otani, Y.

2015-05-18 , Nature Publishing Group , Institute for Solid State Physics, University of Tokyo , Department of Quantum Engineering, Nagoya University , Institute for Materials Research, Tohoku University , CREST, Japan Science and Technology , Advanced Science Research Center, Japan Atomic Energy Agency , RIKEN-CEMS
ISSN:1476-4660 (online)
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UTokyo Research掲載「超伝導体中で磁気の流れを効率良く電流に変換することに成功」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/efficient-conversion-from-spin-currents-to-charge-currents-in-a-superconductor.html
UTokyo Research "Efficient conversion from spin currents to charge currents in a superconductor" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/efficient-conversion-from-spin-currents-to-charge-currents-in-a-superconductor.html
In some materials the competition between superconductivity and magnetism brings about a variety of unique phenomena such as the coexistence of superconductivity and magnetism in heavy-fermion superconductors or spin-triplet supercurrent in ferromagnetic Josephson junctions. Recent observations of spin–charge separation in a lateral spin valve with a superconductor evidence that these remarkable properties are applicable to spintronics, although there are still few works exploring this possibility. Here, we report the experimental observation of the quasiparticle-mediated spin Hall effect in a superconductor, NbN. This compound exhibits the inverse spin Hall (ISH) effect even below the superconducting transition temperature. Surprisingly, the ISH signal increases by more than 2,000 times compared with that in the normal state with a decrease of the injected spin current. The effect disappears when the distance between the voltage probes becomes larger than the charge imbalance length, corroborating that the huge ISH signals measured are mediated by quasiparticles.
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