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

by G. Singh, A. Jouan, S. Hurand, C. Feuillet-Palma, P. Kumar, A. Dogra,
R. Budhani, J. Lesueur and N. Bergeal

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 ∝ 1/τe ) in the presence of a Rashba-type spin-orbit interaction.

Haut de page



À lire aussi...

Competition between electron pairing and phase coherence in superconducting interfaces

by G. Singh, A. Jouan, L. Benfatto, F. Couëdo, P. Kumar, A. Dogra, R.C. Budhani, S. Caprara, M. Grilli, E. Lesne, A. Barthélémy, M. Bibes, C. (...) 

> Lire la suite...

High-temperature superconducting nanomeanders made by ion irradiation

by P. Amari, C. Feuillet-Palma , A. Jouan, F. Couëdo, N. Bourlet, E. Géron, M. Malnou, L. Méchin, A. Sharafiev, J. Lesueur and N. Bergeal In this (...) 

> Lire la suite...