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

Details Intrinsic spin-orbit coupling in superconducting δ-doped SrTiO3 heterostructures Intrinsic spin-orbit coupling in superconducting δ-doped SrTiO3 heterostructures

2011-06-26

arxiv.org/abs/1106.5193v1

Physics

Condensed Matter

Superconductivity

main text 4 pages with 4 figures, supplemental material 2 pages with 2 figure, submitted for publication

Scientific paper

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. Transport scattering times several orders of magnitude higher than for conventional thin film superconductors enables a new regime to be entered, where spin-orbit coupling effects arise non-perturbatively.

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