Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in Nb:SrTiO3

Swartz, Adrian G.; Cheung, Alfred K.  C.; Yoon, Hyeok; Chen, Zhuoyu; Hikita, Yasuyuki; Raghu, Srinivas; Hwang, Harold Y.

doi:10.1103/physrevlett.121.167003

Title: Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in $Nb : {SrTiO}_{3}$

Journal Article · 18 October 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.121.167003 · OSTI ID:1490400

Swartz, Adrian G. ^[1]; Cheung, Alfred K. C. ^[2]; Yoon, Hyeok ^[1]; Chen, Zhuoyu ^[1]; Hikita, Yasuyuki ^[3]; Raghu, Srinivas ^[4]; Hwang, Harold Y. ^[1]

Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials. Dept. of Applied Physics; SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
Stanford Univ., CA (United States). Dept. of Physics
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Inst. for Materials and Energy Sciences; Stanford Univ., CA (United States). Dept. of Physics

We have examined here the intrinsic spin-orbit coupling and orbital depairing in thin films of Nb-doped $${\mathrm{SrTiO}}_{3}$$ by superconducting tunneling spectroscopy. The orbital depairing is geometrically suppressed in the two-dimensional limit, enabling a quantitative evaluation of the Fermi level spin-orbit scattering using Maki's theory. The response of the superconducting gap under in-plane magnetic fields demonstrates short spin-orbit scattering times $${{\tau}}_{\mathrm{so}}{\le}1.1\text{ }\text{ }\mathrm{ps}$$. Analysis of the orbital depairing indicates that the heavy electron band contributes significantly to pairing. These results suggest that the intrinsic spin-orbit scattering time in $${\mathrm{SrTiO}}_{3}$$ is comparable to those associated with Rashba effects in $${\mathrm{SrTiO}}_{3}$$ interfacial conducting layers and can be considered significant in all forms of superconductivity in $${\mathrm{SrTiO}}_{3}$$.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., CA (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1490400

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 121; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in Nb : SrTiO 3

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Title: Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in $Nb : {SrTiO}_{3}$