Research Update: Plentiful magnetic moments in oxygen deficient SrTiO{sub 3}

Journal Article · Thu Oct 01 00:00:00 EDT 2015 · APL Materials

DOI:https://doi.org/10.1063/1.4932347· OSTI ID:22499204

Lopez-Bezanilla, Alejandro ^[1]; Ganesh, P. ^[2]; Littlewood, Peter B. ^[1]

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1. Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439 (United States)
2. Center for Nanophase Materials Science, Oak Ridge National Laboratory, One Bethel Valley Road, Tennessee 37831 (United States)

Correlated band theory is employed to investigate the magnetic and electronic properties of different arrangements of oxygen di- and tri-vacancy clusters in SrTiO{sub 3}. Hole and electron doping of oxygen deficient SrTiO{sub 3} yields various degrees of magnetization as a result of the interaction between localized magnetic moments at the defect sites. Different kinds of Ti atomic orbital hybridization are described as a function of the doping level and defect geometry. We find that magnetism in SrTiO{sub 3−δ} is sensitive to the arrangement of neighbouring vacancy sites, charge carrier density, and vacancy-vacancy interaction. Permanent magnetic moments in the absence of vacancy doping electrons are observed. Our description of the charged clusters of oxygen vacancies widens the previous descriptions of mono- and multi-vacancies and points out the importance of the controlled formation at the atomic level of defects for the realization of transition metal oxide based devices with a desirable magnetic performance.

• OSTI ID: 22499204
• Journal Information: APL Materials, Vol. 3, Issue 10; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 2166-532X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BAND THEORY
CHARGE CARRIERS
DEFECTS
DENSITY
ELECTRONS
HYBRIDIZATION
INTERACTIONS
MAGNETIC MOMENTS
MAGNETISM
MAGNETIZATION
OXIDES
OXYGEN
STRONTIUM TITANATES
TRANSITION ELEMENTS