Spin Hall effect generated by fluctuating vortices in type-II superconductors

Takuya Taira; Yusuke Kato; Masanori Ichioka; Hiroto Adachi

doi:10.1103/PhysRevB.103.134417

Spin Hall effect generated by fluctuating vortices in type-II superconductors

Takuya Taira, Yusuke Kato, Masanori Ichioka, Hiroto Adachi

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

We theoretically investigate the vortex spin Hall effect, i.e., a novel spin Hall effect driven by the motion of superconducting vortices, by focusing on the role of superconducting fluctuations. Within the BCS-Gor'kov microscopic approach combined with the Kubo formula, we find a strong similarity between the vortex spin Hall effect and the vortex Nernst/Ettingshausen effect. Calculated temperature dependence of the voltage signal due to the inverse vortex spin Hall effect exhibits a strong enhancement by vortex fluctuations. This result not only provides a possible explanation for a prominent peak found in the spin Seebeck effect in a NbN/Y3Fe5O12 system but also leads to a proposal of new experiments using other superconductors with strong fluctuations, such as cuprate or iron-based superconductors.

Original language	English
Article number	134417
Journal	Physical Review B
Volume	103
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevB.103.134417
Publication status	Published - Apr 12 2021

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.103.134417

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title = "Spin Hall effect generated by fluctuating vortices in type-II superconductors",

abstract = "We theoretically investigate the vortex spin Hall effect, i.e., a novel spin Hall effect driven by the motion of superconducting vortices, by focusing on the role of superconducting fluctuations. Within the BCS-Gor'kov microscopic approach combined with the Kubo formula, we find a strong similarity between the vortex spin Hall effect and the vortex Nernst/Ettingshausen effect. Calculated temperature dependence of the voltage signal due to the inverse vortex spin Hall effect exhibits a strong enhancement by vortex fluctuations. This result not only provides a possible explanation for a prominent peak found in the spin Seebeck effect in a NbN/Y3Fe5O12 system but also leads to a proposal of new experiments using other superconductors with strong fluctuations, such as cuprate or iron-based superconductors.",

author = "Takuya Taira and Yusuke Kato and Masanori Ichioka and Hiroto Adachi",

note = "Funding Information: This work was financially supported by JSPS KAKENHI Grant No. 19K05253. Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

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AU - Taira, Takuya

AU - Kato, Yusuke

AU - Ichioka, Masanori

AU - Adachi, Hiroto

PY - 2021/4/12

Y1 - 2021/4/12

N2 - We theoretically investigate the vortex spin Hall effect, i.e., a novel spin Hall effect driven by the motion of superconducting vortices, by focusing on the role of superconducting fluctuations. Within the BCS-Gor'kov microscopic approach combined with the Kubo formula, we find a strong similarity between the vortex spin Hall effect and the vortex Nernst/Ettingshausen effect. Calculated temperature dependence of the voltage signal due to the inverse vortex spin Hall effect exhibits a strong enhancement by vortex fluctuations. This result not only provides a possible explanation for a prominent peak found in the spin Seebeck effect in a NbN/Y3Fe5O12 system but also leads to a proposal of new experiments using other superconductors with strong fluctuations, such as cuprate or iron-based superconductors.

AB - We theoretically investigate the vortex spin Hall effect, i.e., a novel spin Hall effect driven by the motion of superconducting vortices, by focusing on the role of superconducting fluctuations. Within the BCS-Gor'kov microscopic approach combined with the Kubo formula, we find a strong similarity between the vortex spin Hall effect and the vortex Nernst/Ettingshausen effect. Calculated temperature dependence of the voltage signal due to the inverse vortex spin Hall effect exhibits a strong enhancement by vortex fluctuations. This result not only provides a possible explanation for a prominent peak found in the spin Seebeck effect in a NbN/Y3Fe5O12 system but also leads to a proposal of new experiments using other superconductors with strong fluctuations, such as cuprate or iron-based superconductors.

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Spin Hall effect generated by fluctuating vortices in type-II superconductors

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