AI Article Synopsis
- - The study investigates how intrinsic spin-orbit coupling and orbital depairing affect Nb-doped SrTiO_{3} thin films using superconducting tunneling spectroscopy.
- - Findings reveal that orbital depairing is reduced in two dimensions, allowing for an accurate measurement of the spin-orbit scattering time, which is found to be very short at τ_{so}≤1.1 ps.
- - The results indicate that the heavy electron band plays a major role in superconducting pairing and suggest that spin-orbit scattering in SrTiO_{3} can significantly influence various superconducting behaviors.
Article Abstract
We have examined the intrinsic spin-orbit coupling and orbital depairing in thin films of Nb-doped SrTiO_{3} by superconducting tunneling spectroscopy. The orbital depairing is geometrically suppressed in the two-dimensional limit, enabling a quantitative evaluation of the Fermi level spin-orbit scattering using Maki's theory. The response of the superconducting gap under in-plane magnetic fields demonstrates short spin-orbit scattering times τ_{so}≤1.1 ps. Analysis of the orbital depairing indicates that the heavy electron band contributes significantly to pairing. These results suggest that the intrinsic spin-orbit scattering time in SrTiO_{3} is comparable to those associated with Rashba effects in SrTiO_{3} interfacial conducting layers and can be considered significant in all forms of superconductivity in SrTiO_{3}.
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| http://dx.doi.org/10.1103/PhysRevLett.121.167003 | DOI Listing |
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