Determination of spin-orbit scattering lifetime at the interface of LaAlO3/SrTiO3 from the superconducting upper critical fields
Akhilesh Kr. Singh, Tsung-Chi Wu, Ming-Yuan Song, Ming-Chin Chen, Chi-Sheng Li, S.-K. Yip, Wei-Li Lee
DOI 10.1103/PhysRevResearch.2.013311 · Physical Review Research
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Abstract
The intrinsic mechanism of the spin-orbit coupling at the LaAlO3/SrTiO3 interface remains a debatable issue. Rashba-type spin-orbit coupling is an appealing candidate that has been demonstrated by several magnetotransport results. On the other hand, the atomic spin-orbit coupling was also shown to play an important role, particularly when the Fermi level is close to the Lifshitz point. In this paper, we focus on the measurements of the anisotropic superconducting upper critical fields in gated LaAlO3/SrTiO3 devices. By rigorous fittings of the Hc2−T curves using both the Werthamer-Helfand-Hohenberg theory and Klemm-Luther-Beasley model, an upper limit of the spin-orbit scattering lifetime can be determined in the two-dimensional limit of the superconducting state. We found that the extracted spin-orbit scattering lifetime monotonically increases with the effective transport lifetime that spans over two orders of magnitude in the regime with sheet density close to and higher than that at the Lifshitz point. Those results suggest the dominant role of Elliott-Yafet type spin relaxation. The comparison to the weak localization fittings on magnetoconductance reveals a striking difference. Such a model dependence infers an electronic phase separation at the LaAlO3/SrTiO3 interface, where the superconductivity originates from a selective d-subband occupancy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3/SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.334 | Pressure not reported | midpoint |
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