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

M. Kim; Y. Kozuka; C. Bell; Y. Hikita; H. Y. Hwang

doi:10.1103/PhysRevB.86.085121

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

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

DOI 10.1103/PhysRevB.86.085121 · Physical Review B

T1

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.374	Pressure not reported	midpoint
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown