Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3 /SrTiO3 interfaces
G. Singh, A. Jouan, S. Hurand, C. Feuillet-Palma, P. Kumar, A. Dogra, R. Budhani, J. Lesueur, N. Bergeal
DOI 10.1103/PhysRevB.96.024509 · Physical Review B
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Abstract
A rather unique feature of the two-dimensional electron gas formed at the interface between the two insulators LaAlO3 and SrTiO3 is to host both gate-tunable superconductivity and strong spin-orbit coupling. In the present work, we use the disorder generated by Cr substitution of Al atoms in LaAlO3 as a tool to explore the nature of superconductivity and spin-orbit coupling in these interfaces. We analyze the transport properties of three different samples whose only relevant difference is their elastic scattering time τe. A reduction of the superconducting Tc is observed with Cr doping consistent with an increase of electron-electron interaction in the presence of disorder. In addition, the evolution of spin-orbit coupling with gate voltage and Cr doping evidences a Dyakonov-Perel mechanism of spin relaxation (τSO∝τe−1) in the presence of a Rashba-type spin-orbit interaction.
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. | 0.17 | Pressure not reported | midpoint |
| LaAl1-xCrxO3/SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.35 | Pressure not reported | midpoint |
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