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arXiv · 1610.01380

Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces

G. Singh·A. Jouan·S. Hurand·C. Palma·P. Kumar·A. Dogra·R. Budhani·J. Lesueur·N. Bergeal
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Abstract

A rather unique feature of the two-dimensional electron gas (2-DEG) 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. A reduction of the superconducting Tc is observed with Cr doping consistent with an increase of electron-electron interaction in presence of disorder. In addition, the evolution of spin-orbit coupling with gate voltage and Cr doping suggests a D'Yakonov-Perel mechanism of spin relaxation in the presence of a Rashba-type spin-orbit interaction.

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G. Singh, A. Jouan, S. Hurand, C. Palma, P. Kumar, A. Dogra, R. Budhani, J. Lesueur, N. Bergeal. 2016-10-05. Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces. https://doi.org/10.1103/physrevb.96.024509

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