2D Electron Gas with 100% Spin-Polarization in the $(LaMnO_{3})_{2}/(SrTiO_{3})_{2}$ Superlattice under Uniaxial Strain

Fabrizio Cossu, Jilili Jiwuer, Udo Schwingenschlögl

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15 Scopus citations

Abstract

By first-principles calculations we investigate the structural, electronic, and magnetic properties of the (LaMnO3)2/(SrTiO3)2 superlattice. We find that a monoclinic C2h symmetry is energetically favorable and that the spins order ferromagnetically. Under both compressive and tensile uniaxial strain the electronic structure of the superlattice shows a half-metallic character. In particular, a fully spin-polarized two-dimensional electron gas, which traces back to the Ti 3dxy orbitals, is achieved under compressive uniaxial strain. The (LaMnO3)2/(SrTiO3)2 superlattice is analysed with respect to its structure, magnetism, and electronic properties. Our results demonstrate that uniaxial strain in an experimentally accessible range, both tensile and compressive, can be used to induce half-metallicity. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Original languageEnglish (US)
Pages (from-to)1400057
JournalAdvanced Materials Interfaces
Volume1
Issue number8
DOIs
StatePublished - Jul 28 2014

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