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

Author:

Lau Yong-ChangORCID,Akiyama RyotaORCID,Hirose Hishiro T,Nakanishi Ryosuke,Terashima Taichi,Uji Shinya,Hasegawa ShujiORCID,Hayashi MasamitsuORCID

Abstract

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.

Funder

Japan Society for the Promotion of Science

Casio Science Foundation

CSRN

Publisher

IOP Publishing

Subject

Condensed Matter Physics,General Materials Science,Atomic and Molecular Physics, and Optics

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