Electrolyte gate-controlled kondo effect in SrTiO 3

Menyoung Lee, J. R. Williams, Sipei Zhang, C. Daniel Frisbie, D. Goldhaber-Gordon

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Abstract

We report low-temperature, high-field magnetotransport measurements of SrTiO 3 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 SrTiO 3 as an admixture of magnetic Ti3 + ions, i.e., localized and unpaired electrons, and delocalized electrons that partially fill the Ti 3d conduction band.

Original languageEnglish (US)
Article number256601
JournalPhysical review letters
Volume107
Issue number25
DOIs
StatePublished - Dec 12 2011

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