Ferromagnetic and insulating behavior of LaCoO3 films grown on a (001) SrTiO3 substrate: A simple ionic picture explained ab initio
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Title: | Ferromagnetic and insulating behavior of LaCoO3 films grown on a (001) SrTiO3 substrate: A simple ionic picture explained ab initio |
Author: | Otero Fumega, Adolfo Pardo Castro, Víctor |
Affiliation: | Universidade de Santiago de Compostela. Departamento de Física Aplicada Universidade de Santiago de Compostela. Instituto de Investigacións Tecnolóxicas |
Subject: | Crystal defects | Crystal structure | Electronic structure | Ferromagnetism | Magnetic insulators | Oxides | Crystal-field theory | Density functional theory | Condensed Matter & Materials Physics | |
Date of Issue: | 2017-10-06 |
Publisher: | American Physical Society |
Citation: | PHYSICAL REVIEW MATERIALS 1, 054403 (2017) |
Abstract: | This paper shows that the oxygen vacancies observed experimentally in thin films of LaCoO3 subject to tensile strain are thermodynamically stable according to ab initio calculations. By using DFT calculations, we show that oxygen vacancies on the order of 6% forming chains perpendicular to the (001) direction are more stable than the stoichiometric solution. These lead to magnetic Co2+ ions surrounding the vacancies that couple ferromagnetically. The remaining Co3+ cations in an octahedral environment are nonmagnetic. The gap leading to a ferromagnetic insulating phase occurs naturally and we provide a simple ionic picture to explain the resulting electronic structure |
Publisher version: | https://doi.org/10.1103/PhysRevMaterials.1.054403 |
URI: | http://hdl.handle.net/10347/20437 |
DOI: | 10.1103/PhysRevMaterials.1.054403 |
E-ISSN: | 2475-9953 |
Rights: | ©2017 American Physical Society |
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