Superconducting Tunneling Spectroscopy of Spin-Orbit Coupling and Orbital Depairing in Nb:SrTiO3
Adrian G. Swartz, Alfred K. C. Cheung, Hyeok Yoon, Zhuoyu Chen, Yasuyuki Hikita, Srinivas Raghu, Harold Y. Hwang
DOI 10.1103/PhysRevLett.121.167003 · Physical Review Letters
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Abstract
We have examined the intrinsic spin-orbit coupling and orbital depairing in thin films of Nb-doped SrTiO3 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 τso≤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 SrTiO3 is comparable to those associated with Rashba effects in SrTiO3 interfacial conducting layers and can be considered significant in all forms of superconductivity in SrTiO3.
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. | 0.33 | Pressure not reported | unknown |
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