Concomitance of superconducting spin–orbit scattering length and normal state spin diffusion length in W on (Bi,Sb)2Te3

Yong Chang Lau, Ryota Akiyama, Hishiro T. Hirose, Ryosuke Nakanishi, Taichi Terashima, Shinya Uji, Shuji Hasegawa, Masamitsu Hayashi

Research output: Contribution to journalArticlepeer-review

Abstract

We report the observation of an anomalously large in-plane upper critical field, exceeding at least 2.5 times the Pauli paramagnetic limit, in a thin superconducting W film grown on a topological insulator (Bi,Sb)2Te3. This can be accounted for by setting the spin–orbit scattering length of superconducting W to a value ranging from 1 to 2 nm, which is comparable to the spin diffusion length of normal state W. The coupling between the topological surface states of (Bi,Sb)2Te3 and the wave functions of superconducting W may also contribute to the observed giant critical field. Our results suggest the universality of the spin–orbit scattering formalism for describing the transport involving the diffusive carriers as well as the Cooper pairs in systems with strong spin–orbit coupling.

Original languageEnglish
Article number034001
JournalJPhys Materials
Volume3
Issue number3
DOIs
Publication statusPublished - 2020 Jul
Externally publishedYes

Keywords

  • Pauli paramagnetic limit
  • Spin diffusion
  • Spin–orbit coupling
  • Superconductor
  • Topological insulators

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

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