Intrinsic spin-orbit coupling in superconducting $\ensuremath{\delta}$-doped SrTiO${}_{3}$ heterostructures

Intrinsic spin-orbit coupling in superconducting $δ$ -doped SrTiO $_{3}$ heterostructures

M. Kim, Y. Kozuka, C. Bell, Y. Hikita, and H. Y. Hwang

Phys. Rev. B 86, 085121 – Published 15 August 2012

Abstract

We report the violation of the Pauli limit due to intrinsic spin-orbit coupling in SrTiO $_{3}$ 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.

Received 25 June 2011

DOI:https://doi.org/10.1103/PhysRevB.86.085121

Authors & Affiliations

M. Kim^1,2, Y. Kozuka^2,3, C. Bell¹, Y. Hikita¹, and H. Y. Hwang^1,4

¹Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
²Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan
³Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
⁴Geballe Laboratory for Advanced Materials, Department of Applied Physics, Stanford University, Stanford, California 94305, USA

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Vol. 86, Iss. 8 — 15 August 2012

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Physical Review B

covering condensed matter and materials physics

Intrinsic spin-orbit coupling in superconducting $δ$ -doped SrTiO $_{3}$ heterostructures

M. Kim, Y. Kozuka, C. Bell, Y. Hikita, and H. Y. Hwang

Phys. Rev. B 86, 085121 – Published 15 August 2012

Abstract

Authors & Affiliations

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Physical Review B

covering condensed matter and materials physics

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

M. Kim, Y. Kozuka, C. Bell, Y. Hikita, and H. Y. Hwang

Phys. Rev. B 86, 085121 – Published 15 August 2012

Abstract

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Intrinsic spin-orbit coupling in superconducting $δ$ -doped SrTiO $_{3}$ heterostructures