Nanoscale imaging of the electronic and structural transitions in vanadium dioxide

M. M. Qazilbash, A. Tripathi, A. A. Schafgans, Bong-Jun Kim, Hyun-Tak Kim, Zhonghou Cai, M. V. Holt, J. M. Maser, F. Keilmann, O. G. Shpyrko, and D. N. Basov
Phys. Rev. B 83, 165108 – Published 13 April 2011

Abstract

We investigate the electronic and structural changes at the nanoscale in vanadium dioxide (VO2) in the vicinity of its thermally driven phase transition. Both electronic and structural changes exhibit phase coexistence leading to percolation. In addition, we observe a dichotomy between the local electronic and structural transitions. Nanoscale x-ray diffraction reveals local, nonmonotonic switching of the lattice structure, a phenomenon that is not seen in the electronic insulator-to-metal transition mapped by near-field infrared microscopy.

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  • Received 10 January 2011

DOI:https://doi.org/10.1103/PhysRevB.83.165108

©2011 American Physical Society

Authors & Affiliations

M. M. Qazilbash1,*, A. Tripathi1, A. A. Schafgans1, Bong-Jun Kim2, Hyun-Tak Kim2,3, Zhonghou Cai4, M. V. Holt5, J. M. Maser5, F. Keilmann6, O. G. Shpyrko1, and D. N. Basov1

  • 1Department of Physics, University of California San Diego, La Jolla, California 92093, USA
  • 2Metal-Insulator Transition Center, Electronics and Telecommunications Research Institute (ETRI), Daejeon 305-350, Korea
  • 3School of Advanced Device Technology, University of Science and Technology, Daejeon 305-333, Korea
  • 4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 6Max Planck Institute of Quantum Optics, Munich Centre for Advanced Photonics and Center for NanoScience, D-85748 Garching, Germany

  • *Permanent address: Department of Physics, College of William and Mary, Williamsburg, Virginia 23187, USA; mumtaz@wm.edu

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Issue

Vol. 83, Iss. 16 — 15 April 2011

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