Intrinsic spin-orbit coupling in superconducting delta-doped SrTiO3 heterostructures

M. Kim*, Y. Kozuka, C. Bell, Y. Hikita, H. Y. Hwang, Chris Bell

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

37 Citations (Scopus)

Abstract

We report the violation of the Pauli limit due to intrinsic spin-orbit coupling in SrTiO3 heterostructures. Via selective doping down to a few nanometers, a two-dimensional superconductor is formed, geometrically suppressing orbital pair breaking. The spin-orbit scattering is exposed by the robust in-plane superconducting upper critical field, exceeding the Pauli limit by a factor of 4. Moreover, transport scattering times several orders of magnitude higher than for conventional thin-film superconductors enable this system to enter a different regime of cleanliness, where intrinsic band spin-orbit coupling effects arise in these symmetrically doped samples.

Original languageEnglish
Article number085121
Number of pages6
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume86
Issue number8
DOIs
Publication statusPublished - 15 Aug 2012

Keywords

  • HIGH-FIELD SUPERCONDUCTORS
  • WEAK-LOCALIZATION
  • ELECTRON-SPIN
  • FILMS
  • TRANSITION
  • STATE

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