Magnetoresistive evidence for the origin of the metal-insulator transition in V<sub>2</sub>O<sub>3</sub>

ORAL

Abstract

V2O3 is a strongly correlated oxide that displays simultaneously an electronic, a structural and a magnetic phase transition. The origin of these transitions has been one of the outstanding problems in condensed-matter physics. We investigated the metal-insulator transition (MIT) using magneto-transport measurements of He-irradiated V2O3 thin films. The irradiation provides the means to shift the metal-insulator transition with dose. We found an anomalous evolution of the magnetoresistance with temperature as it approaches the MIT. This behavior shifts in temperature following the MIT in irradiated samples. Dynamical mean-field theory calculations of the Hubbard model closely capture this anomalous behavior, providing strong evidence that an antiferromagnetic instability drives the opening of a gap in V2O3.

*Work supported by the US DOE and the Vannevar Bush Faculty Fellowship program. J. Trastoy and J. del Valle thank Fundación Areces (Spain) for postdoctoral fellowships.

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Presenters

  • Juan Trastoy

    • Unite Mixte de Physique CNRS/Thales
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego

Authors

  • Juan Trastoy

    • Unite Mixte de Physique CNRS/Thales
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego

  • Alberto Camjayi

    • Departamento de Física, UBA and IFIBA

  • Yoav Kalcheim

    • Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego
    • Physics Department and Center for Advanced Nanoscience, University of California San Diego

  • Javier Del Valle Granda

    • Department of Physics, Univ of California - San Diego
    • Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego
    • Physics Department and Center for Advanced Nanoscience, University of California San Diego

  • Jean-Paul Crocombette

    • SRMP, CEA
    • Service de Recherches de Métallurgie Physique, CEA, DEN

  • Javier Villegas

    • Unite Mixte de Physique CNRS/Thales
    • Unité Mixte de Physique CNRS/Thales

  • Marcelo Rozenberg

    • Laboratoire de Physique des Solides, CNRS/Universite Paris-Sud
    • Laboratoire de Physique des Solides, Université Paris-Sud

  • Dafiné Ravelosona

    • Univ of Paris - Sud 11 CNRS
    • Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud

  • Ivan Schuller

    • Department of Physics, Univ of California - San Diego
    • University of California, San Diego
    • Department of Physics and Center for Advanced Nanoscience, Univ of California - San Diego
    • UC San Diego
    • Department of Physics and Center for Advance Nanoscience, University of California San Diego
    • Physics Department and Center for Advanced Nanoscience, University of California San Diego
    • Univ of California - San Diego
    • Physics, University of California, San Diego