Artículo
Tuning the insulator-metal transition in oxide interfaces: an ab initio study exploring the role of oxygen vacancies and cation interdiffusion
Fecha de publicación:
07/2014
Editorial:
Wiley VCH Verlag
Revista:
Physica Status Solidi B-basic Research
ISSN:
0370-1972
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We investigate the structural, electronic, and magnetic properties of a particular interface in the oxide heterostructures LaAlOmath formula/SrTiOmath formula (LAO/STO) and TiOmath formula-anatase/LaAlOmath formula (TiOmath formula/LAO), namely the interface of AlOmath formula facing TiOmath formula, which is the energetically preferred one in the presence of interfacial oxygen vacancies. The optimum stacking for the ground state is different for each heterostructure with the interfacial Ti atoms being located either at hollow or bridge sites facing the AlOmath formula surface layer. This structural property determines the electronic character of the interface and as a consequence, in LAO/STO it is metallic while in TiOmath formula/LAO it can be semiconducting and magnetic for a large concentration of vacancies. In addition, we find that cation interdiffusion at this interface is an energetically favored defect in both heterostructures with interfacial vacancies. Its main effect is to increase the size of the band gap in the semiconducting case and to open up a gap in the metallic one, thus allowing for a tuning of a metal to insulator transition.
Palabras clave:
Interfaces
,
Oxides
,
Metal-Insulator Transition
,
Oxygen Vacancies
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Ferrari, Valeria Paola; Weissmann, Mariana Dorotea; Tuning the insulator-metal transition in oxide interfaces: an ab initio study exploring the role of oxygen vacancies and cation interdiffusion; Wiley VCH Verlag; Physica Status Solidi B-basic Research; 251; 8; 7-2014; 1601-1607
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