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Electrolyte Gate-Controlled Kondo Effect in SrTiO3

Menyoung Lee, J. R. Williams, Sipei Zhang, C. Daniel Frisbie, and D. Goldhaber-Gordon
Phys. Rev. Lett. 107, 256601 – Published 12 December 2011
Physics logo See Viewpoint: Tuning Correlations in a 2D Electron Liquid
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Abstract

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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  • Received 5 August 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.256601

© 2011 American Physical Society

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Tuning Correlations in a 2D Electron Liquid

Published 12 December 2011

Simulating part of a perovskite heterostructure with a polarizable gel reveals the instrinsic properties of a two-dimensional electron liquid.

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Authors & Affiliations

Menyoung Lee1, J. R. Williams1, Sipei Zhang2, C. Daniel Frisbie2, and D. Goldhaber-Gordon1,*

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA

  • *goldhaber-gordon@stanford.edu

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Issue

Vol. 107, Iss. 25 — 16 December 2011

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