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

IR@NPL: CSIR-National Physical Laboratory, New Delhi


Field	Value

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

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

Subject	Applied Physics/Condensed Matter

Description	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 tau(e). A reduction of the superconducting T-c 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 (tau(SO) proportional to tau(-1)(e)) in the presence of a Rashba-type spin-orbit interaction.

Publisher	American Physical Society

Date	2017-07-18

Type	Article PeerReviewed

Format	application/pdf

Identifier	http://npl.csircentral.net/2663/1/Effect%20of%20disorder%20on%20superconductivity%20and%20Rashba%20spin-orbit%20coupling%20in%20.pdf Singh, G. and Jouan, A. and Hurand, S. and Feuillet-Palma, C. and Kumar, P. and Dogra, A. and Budhani, R. and Lesueur, J. and Bergeal, N. (2017) Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces. Physical Review B, 96 (2). 024509-1-024509-6. ISSN 2469-9950

Relation	http://npl.csircentral.net/2663/