Inelastic Neutron Scattering studies of pure and Mo doped VO$_{2}$

ORAL

Abstract

For the last half-century~VO$_{2}$ has been viewed as an~archetypal system for studying~the~metal-insulator~transition (MIT). Moreover, there is currently intense interest in this material arising from its promising use in fast energy efficient electronic devices.~ There are key unresolved issues connected with the origin of ~the MIT, including the role of magnetism arising from the S$=$1/2 V$^{4+}$ ions.~ It is known that below 340 K in undoped VO$_{2}$ the V ions form structural dimers in the insulating M1 monoclinic phase.~ Here we report the results of new inelastic neutron scattering measurements of VO$_{2}$ and V$_{0.75}$Mo$_{0.25}$O$_{2}$. Using the~SEQUOIA chopper spectrometer at the SNS~possible lattice and magnetic excitations for energies up to 600 meV were investigated. We discuss the results in the context of current ideas concerning the MIT in VO$_{2}$.

*The research at ORNL is supported by the DOE BES, Division of Scientific User Facilities. Work at Princeton University is supported by the DOE grant number DE-FG02-98ER45706.

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Authors

  • Arnab Banerjee

    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
    • The University of Chicago/Oak Ridge National Laboratory

  • Garrett Granroth

    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
    • ORNL, TN
    • Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory
    • Oak Ridge National Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Yuen Yiu

    • Univ of Tennessee, Knoxville
    • Department of Physics, University of Tennessee, Knoxville TN 37996 USA

  • A.A. Aczel

    • Oak Ridge National Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Alexander I. Koleshnikov

    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA

  • Huxia Luo

    • Department of Chemistry, Princeton university, Princeton NJ 08544 USA

  • Robert Cava

    • Department of Chemistry, Princeton University
    • Department of Chemistry, Princeton university, Princeton NJ 08544 USA
    • Princeton University Chemistry Department
    • Institute for Quantum Matter, Princeton University
    • Department of Chemistry, Princeton University, NJ, 08544, USA
    • Princeton University

  • Stephen Nagler

    • Oak Ridge Natl Lab
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge TN 37830 USA
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory