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  Giant transition-state quasiparticle spin-Hall effect in an exchange-spin-split superconductor detected by nonlocal magnon spin transport

Jeon, K.-R., Jeon, J.-C., Zhou, X., Migliorini, A., Yoon, J., & Parkin, S. S. P. (2020). Giant transition-state quasiparticle spin-Hall effect in an exchange-spin-split superconductor detected by nonlocal magnon spin transport. ACS Nano, 14(11), 15874-15883. doi:10.1021/acsnano.0c07187.

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https://doi.org/10.1021/acsnano.0c07187 (Publisher version)
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 Creators:
Jeon, Kun-Rok1, Author              
Jeon, Jae-Chun1, Author              
Zhou, Xilin1, Author
Migliorini, Andrea1, Author              
Yoon, Jiho1, Author              
Parkin, S. S. P.1, Author              
Affiliations:
1Nano-Systems from Ions, Spins and Electrons, Max Planck Institute of Microstructure Physics, Max Planck Society, ou_3287476              

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 Abstract: Although recent experiments and theories have shown a variety of exotic transport properties of nonequilibrium quasiparticles (QPs) in superconductor (SC)-based devices with either Zeeman or exchange spin-splitting, how a QP interplays with magnon spin currents remains elusive. Here, using nonlocal magnon spin-transport devices where a singlet SC (Nb) on top of a ferrimagnetic insulator (Y3Fe5O12) serves as a magnon spin detector, we demonstrate that the conversion efficiency of magnon spin to QP charge via inverse spin-Hall effect (iSHE) in such an exchange-spin-split SC can be greatly enhanced by up to 3 orders of magnitude compared with that in the normal state, particularly when its interface superconducting gap matches the magnon spin accumulation. Through systematic measurements by varying the current density and SC thickness, we identify that superconducting coherence peaks and exchange spin-splitting of the QP density-of-states, yielding a larger spin excitation while retaining a modest QP charge-imbalance relaxation, are responsible for the giant QP iSHE. The latter exchange-field-modified QP relaxation is experimentally proved by spatially resolved measurements with varying the separation of electrical contacts on the spin-split Nb.

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 Dates: 2020-11-122020-11-24
 Publication Status: Published in print
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 Identifiers: BibTex Citekey: P14021
DOI: 10.1021/acsnano.0c07187
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Title: ACS Nano
  Other : ACS Nano
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 14 (11) Sequence Number: - Start / End Page: 15874 - 15883 Identifier: ISSN: 1936-0851
CoNE: https://pure.mpg.de/cone/journals/resource/1936-0851