Signatures of a two-dimensional ferromagnetic electron gas at the La0.7Sr0.3MnO3/SrTiO3interface 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

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Abstract

An experiment was conducted to show that an LSMO 2DEG emerges at the interfaces of [(La0.7Sr0.3MnO3/SrTiO3] 8 (LSMO/STO) superlattices grown in the (001) direction. Calculations of resistivity in a model system including spin-orbit coupling reveal that the inplane peak is due to transport through a two-dimensional (2D) system at the manganite interface. Density Functional Theory (DFT+U) calculations confirm that the 2D system results from a FM and metallic interfacial manganite layer antiferromagnetically coupled (A-type) to the rest of the LSMO. The X-ray absorption experiments clearly indicate an in-plane orbital polarization of the interfacial e g Mn electrons. Such magnetic modification could be related to the spin depolarization revealed by tunneling magnetoresistance measurements in manganite based tunneling devices. X-ray magnetic circular dichroism and EELS measurements have revealed a small charge transfer to Ti giving rise to a magnetic moment which is anti-parallel to that on the Mn sites.

Original languageEnglish (US)
Article number02829
Pages (from-to)7516-7520
Number of pages5
JournalAdvanced Materials
Volume26
Issue number44
DOIs
StatePublished - Jan 1 2014

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