Signatures of a two-dimensional ferromagnetic electron gas at the La0.7Sr0.3MnO3/SrTiO3 interface arising from orbital reconstruction

Norbert Marcel Nemes; María José Calderón; Juan Ignacio Beltrán; Flavio Yair Bruno; Javier García-Barriocanal; Zouhair Sefrioui; Carlos León; Mar García-Hernández; María Carmen Muñoz; Luis Brey; Jacobo Santamaría

doi:10.1002/adma.201402829

Signatures of a two-dimensional ferromagnetic electron gas at the La0.7Sr0.3MnO3/SrTiO3 interface arising from orbital reconstruction

Adv Mater. 2014 Nov 26;26(44):7516-20. doi: 10.1002/adma.201402829. Epub 2014 Oct 18.

Authors

Norbert Marcel Nemes¹, María José Calderón, Juan Ignacio Beltrán, Flavio Yair Bruno, Javier García-Barriocanal, Zouhair Sefrioui, Carlos León, Mar García-Hernández, María Carmen Muñoz, Luis Brey, Jacobo Santamaría

Affiliation

¹ GFMC, Departamento de Física Aplicada III, Universidad Complutense de Madrid, Campus Moncloa, E-28040, Madrid, Spain; Laboratorio de Heteroestructuras con aplicación en Spintronica, Unidad Asociada Consejo Superior de Investigaciones Científicas/Universidad Complutense Madrid, Sor Juana Inés de la Cruz, 3, E-28049, Madrid, Spain.

PMID: 25327446
DOI: 10.1002/adma.201402829

Abstract

The magnetoresistance of La0.7Sr0.3MnO3/SrTiO3 superlattices with magnetic field rotating out-of-plane shows unexpected peaks for in-plane fields. Resistivity calculations with spin-orbit coupling reveal that orbital reconstruction at the manganite interface leads to a 2D ferromagnetic electron gas coupled antiparallel to the manganite "bulk". These orbital and magnetic reconstructions are supported by X-ray linear dichroism and ab initio calculations.

Keywords: 2DEG; magnetoresistance; manganites; oxide interfaces.