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

被引：23

作者：

Singh, G. ^{[1
,2
]}

Jouan, A. ^{[1
,2
]}

Hurand, S. ^{[1
,2
]}

Feuillet-Palma, C. ^{[1
,2
]}

Kumar, P. ^{[3
]}

Dogra, A. ^{[3
]}

Budhani, R. ^{[3
,4
]}

Lesueur, J. ^{[1
,2
]}

Bergeal, N. ^{[1
,2
]}

机构：

[1] PSL Res Univ, CNRS, ESPCI Paris, Lab Phys & Etud Mat, 10 Rue Vauquelin, F-75005 Paris, France

[2] Sorbonne Univ, Univ Pierre & Marie Curie, F-75005 Paris, France

[3] CSIR, Natl Phys Lab, Dr KS Krishnan Marg, New Delhi 110012, India

[4] Indian Inst Technol, Dept Phys, Condensed Matter Low Dimens Syst Lab, Kanpur 208016, Uttar Pradesh, India

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 02期

关键词：

2-DIMENSIONAL SUPERCONDUCTIVITY; OXIDE INTERFACES; ELECTRON GASES; SYSTEMS; MAGNETORESISTANCE; HETEROSTRUCTURES; COEXISTENCE; CARRIERS;

D O I：

10.1103/PhysRevB.96.024509

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

页数：6

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