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

共 45 条

[31] Oxide Interfaces-An Opportunity for Electronics [J].

Mannhart, J. ;

Schlom, D. G. .

SCIENCE, 2010, 327 (5973) :1607-1611

[32] Why some interfaces cannot be sharp [J].

Nakagawa, N ;

Hwang, HY ;

Muller, DA .

NATURE MATERIALS, 2006, 5 (03) :204-209

[33] A high-mobility electron gas at the LaAlO3/SrTiO3 heterointerface [J].

Ohtomo, A ;

Hwang, HY .

NATURE, 2004, 427 (6973) :423-426

[34] Transport properties of LaTiO3/SrTiO3 heterostructures [J].

Ohtsuka, R. ;

Matvejeff, M. ;

Nishio, K. ;

Takahashi, R. ;

Lippmaa, M. .

APPLIED PHYSICS LETTERS, 2010, 96 (19)

[35]

Perel V, 1972, SOV PHYS-SOLID STATE, V13, P3023

[36] Origin of the Two-Dimensional Electron Gas Carrier Density at the LaAlO3 on SrTiO3 Interface [J].

Popovic, Zoran S. ;

Satpathy, Sashi ;

Martin, Richard M. .

PHYSICAL REVIEW LETTERS, 2008, 101 (25)

[37] Superconducting interfaces between insulating oxides [J].

Reyren, N. ;

Thiel, S. ;

Caviglia, A. D. ;

Kourkoutis, L. Fitting ;

Hammerl, G. ;

Richter, C. ;

Schneider, C. W. ;

Kopp, T. ;

Ruetschi, A.-S. ;

Jaccard, D. ;

Gabay, M. ;

Muller, D. A. ;

Triscone, J.-M. ;

Mannhart, J. .

SCIENCE, 2007, 317 (5842) :1196-1199

[38] Anisotropy of the superconducting transport properties of the LaAlO3/SrTiO3 interface [J].

Reyren, N. ;

Gariglio, S. ;

Caviglia, A. D. ;

Jaccard, D. ;

Schneider, T. ;

Triscone, J. -M. .

APPLIED PHYSICS LETTERS, 2009, 94 (11)

[39] Interface superconductor with gap behaviour like a high-temperature superconductor [J].

Richter, C. ;

Boschker, H. ;

Dietsche, W. ;

Fillis-Tsirakis, E. ;

Jany, R. ;

Loder, F. ;

Kourkoutis, L. F. ;

Muller, D. A. ;

Kirtley, J. R. ;

Schneider, C. W. ;

Mannhart, J. .

NATURE, 2013, 502 (7472) :528-+

[40] LaAlO3/SrTiO3 interfaces doped with rare-earth ions [J].

Sanders, T. D. ;

Gray, M. T. ;

Wong, F. J. ;

Suzuki, Y. .

PHYSICAL REVIEW B, 2015, 91 (20)

← 1 2 3 4 5 →