Research Update: Plentiful magnetic moments in oxygen deficient SrTiO 3
Abstract
Correlated band theory is employed to investigate the magnetic and electronic properties of different arrangements of oxygen di- and tri-vacancy clusters in SrTiO3. Hole and electron doping of oxygen deficient SrTiO3 yields various degrees of magnetization as a result of the interaction between localized magnetic moments at the defected 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 SrTiO3-d 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.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1223038
- Alternate Identifier(s):
- OSTI ID: 1223082; OSTI ID: 1237942; OSTI ID: 1421220
- Grant/Contract Number:
- AC02-06CH11357; AC05-00OR22725
- Resource Type:
- Published Article
- Journal Name:
- APL Materials
- Additional Journal Information:
- Journal Name: APL Materials Journal Volume: 3 Journal Issue: 10; Journal ID: ISSN 2166-532X
- Publisher:
- American Institute of Physics
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; magnetic moments; doping; vacancies; electron doped superconductors; materials properties
Citation Formats
Lopez-Bezanilla, Alejandro, Ganesh, P., and Littlewood, Peter B. Research Update: Plentiful magnetic moments in oxygen deficient SrTiO 3. United States: N. p., 2015.
Web. doi:10.1063/1.4932347.
Lopez-Bezanilla, Alejandro, Ganesh, P., & Littlewood, Peter B. Research Update: Plentiful magnetic moments in oxygen deficient SrTiO 3. United States. https://doi.org/10.1063/1.4932347
Lopez-Bezanilla, Alejandro, Ganesh, P., and Littlewood, Peter B. Thu .
"Research Update: Plentiful magnetic moments in oxygen deficient SrTiO 3". United States. https://doi.org/10.1063/1.4932347.
@article{osti_1223038,
title = {Research Update: Plentiful magnetic moments in oxygen deficient SrTiO 3},
author = {Lopez-Bezanilla, Alejandro and Ganesh, P. and Littlewood, Peter B.},
abstractNote = {Correlated band theory is employed to investigate the magnetic and electronic properties of different arrangements of oxygen di- and tri-vacancy clusters in SrTiO3. Hole and electron doping of oxygen deficient SrTiO3 yields various degrees of magnetization as a result of the interaction between localized magnetic moments at the defected 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 SrTiO3-d 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.},
doi = {10.1063/1.4932347},
journal = {APL Materials},
number = 10,
volume = 3,
place = {United States},
year = {Thu Oct 01 00:00:00 EDT 2015},
month = {Thu Oct 01 00:00:00 EDT 2015}
}
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