Trends in (LaMnO3)n/(SrTiO3)m superlattices with varying layer thicknesses

Jilili Jiwuer, Fabrizio Cossu, Udo Schwingenschlögl

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6 Scopus citations

Abstract

We investigate the thickness dependence of the structural, electronic, and magnetic properties of (LaMnO3)n/(SrTiO3)m (n, m = 2, 4, 6, 8) superlattices using density functional theory. The electronic structure turns out to be highly sensitive to the onsite Coulomb interaction. In contrast to bulk SrTiO3, strongly distorted O octahedra are observed in the SrTiO3 layers with a systematic off centering of the Ti atoms. The systems favour ferromagnetic spin ordering rather than the antiferromagnetic spin ordering of bulk LaMnO3 and all show half-metallicity, while a systematic reduction of the minority spin band gaps as a function of the LaMnO3 and SrTiO3 layer thicknesses originates from modifications of the Ti dxy states.
Original languageEnglish (US)
JournalScientific Reports
Volume5
Issue number1
DOIs
StatePublished - Sep 1 2015

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