Decoupling of Structural and Electronic Phase Transitions in VO2

Zhensheng Tao, Tzong-Ru T. Han, Subhendra D. Mahanti, Phillip M. Duxbury, Fei Yuan, Chong-Yu Ruan, Kevin Wang, and Junqiao Wu
Phys. Rev. Lett. 109, 166406 – Published 18 October 2012
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Abstract

Using optical, TEM, and ultrafast electron diffraction experiments we find that single crystal VO2 microbeams gently placed on insulating substrates or metal grids exhibit different behaviors, with structural and metal-insulator transitions occurring at the same temperature for insulating substrates, while for metal substrates a new monoclinic metal phase lies between the insulating monoclinic phase and the metallic rutile phase. The structural and electronic phase transitions in these experiments are strongly first order and we discuss their origins in the context of current understanding of multiorbital splitting, strong correlation effects, and structural distortions that act cooperatively in this system.

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  • Received 11 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.166406

© 2012 American Physical Society

Authors & Affiliations

Zhensheng Tao, Tzong-Ru T. Han, Subhendra D. Mahanti, Phillip M. Duxbury, Fei Yuan, and Chong-Yu Ruan*

  • Physics and Astronomy Department, Michigan State University, East Lansing, Michigan 48824, USA

Kevin Wang and Junqiao Wu

  • Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA and Division of Materials Sciences, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *Corresponding author. ruan@pa.msu.edu

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Vol. 109, Iss. 16 — 19 October 2012

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