Unveiling the Origin of the Insulating Ferromagnetism in LaMnO3 Thin Film

Abstract

By combining genetic algorithm optimizations, first-principles calculations and the double-exchange model studies, we have unveiled that the exotic insulating ferromagnetism in LaMnO3 thin film originates from the previously unreported G-type d_{3z^2-r^2}/d_{x^2-y^2} orbital ordering. An insulating gap opens as a result of both the orbital ordering and the strong electron-phonon coupling. Therefore, there exist two strain induced phase transitions in the LaMnO3 thin film, from the insulating A-type antiferromagnetic phase to the insulating ferromagnetic phase and then to the metallic ferromagnetic phase. These phase transitions may be exploited in tunneling magnetoresistance and tunneling electroresistance related devices.

4 Figures and 1 Table

References in corpus (6)

• Strong coupling of Jahn-Teller distortion to oxygen-octahedron rotation and functional properties in epitaxially-strained orthorhombic LaMnO${}_3$
• Metal-insulator transition in $(LaMn{O}_3{)}_{2n}/(SrMn{O}_3{)}_n$ superlattices
• Strain-induced ferromagnetism in antiferromagnetic LuMnO3 thin films
• Tunable ferroelectricity in artificial tri-layer superlattices comprised of non-ferroic components
• Determination of the exchange anisotropy in perovskite antiferromagnets using powder inelastic neutron scattering
• Polarization Enhancement in Perovskite Superlattices by Oxygen Octahedral Tilts

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• Appearance and disappearance of ferromagnetism in ultra-thin LaMnO${}_3$ on SrTiO${}_3$ substrate: a viewpoint from first-principles
• Electron-Lattice Interplays in LaMnO3 from Canonical Jahn-Teller Distortion Notations
• Strain-induced tuning of the electronic Coulomb interaction in 3d transition metal oxide perovskites
• Charge density functional plus $U$ theory of LaMnO${}_3$: Phase diagram, electronic structure, and magnetic interaction
• Electronic and Magnetic State of LaMnO${}_3$ Epitaxially Strained on SrTiO${}_3$: Effect of Local Correlation and Non-local Exchange
• Emergence of a ferromagnetic insulating state in LaMnO${}_3$/SrTiO${}_3$ heterostructures: The role of strong electronic correlations and strain
• Emergent Magnetic Phenomenon with Unconventional Structure in Epitaxial Manganate Thin Films
• Decoupling the effects of geometry and nature of strain in LaMnO${}_3$: Interplay of dynamic correlations and uniaxial strain driving magnetic phase transitions
• Strain-engineered high-temperature ferromagnetic Oxygen-substituted NaMnF3 from first principles
• Imaging the suppression of ferromagnetism in LaMnO${}_3$ by metallic overlayers