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.
@article{arxiv.1106.5193,
title = {Intrinsic spin-orbit coupling in superconducting {\delta}-doped SrTiO3 heterostructures},
author = {M. Kim and Y. Kozuka and C. Bell and Y. Hikita and H. Y. Hwang},
journal= {arXiv preprint arXiv:1106.5193},
year = {2015}
}
Comments
main text 4 pages with 4 figures, supplemental material 2 pages with 2 figure, submitted for publication