Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.256601
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Funding
- Center on Nanostructuring for Efficient Energy Conversion, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001060]
- MURI of the Army Research Office [W911-NF-09-1-0398]
- National Science Foundation at the University of Minnesota [DMR-0819885]
- Samsung and Stanford University
- National Science Foundation [DMR-0654118]
- State of Florida
- U.S. Department of Energy
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We report low-temperature, high-field magnetotransport measurements of SrTiO3 gated by an ionic gel electrolyte. A saturating resistance upturn and negative magnetoresistance that signal the emergence of the Kondo effect appear for higher applied gate voltages. This observation, enabled by the wide tunability of the ionic gel-applied electric field, promotes the interpretation of the electric field-effect-induced 2D electron system in SrTiO3 as an admixture of magnetic Ti3+ ions, i.e., localized and unpaired electrons, and delocalized electrons that partially fill the Ti 3d conduction band.
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