Correlation-driven insulator-metal transition in near-ideal vanadium dioxide films [electronic resource].
- Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 116,403 : digital, PDF file
- Additional Creators:
- SLAC National Accelerator Laboratory, United States. Department of Energy. Office of Basic Energy Sciences, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- We use polarization- and temperature-dependent x-ray absorption spectroscopy, in combination with photoelectron microscopy, x-ray diffraction, and electronic transport measurements, to study the driving force behind the insulator-metal transition in VO<sub>2</sub>. We show that both the collapse of the insulating gap and the concomitant change in crystal symmetry in homogeneously strained single-crystalline VO<sub>2</sub> films are preceded by the purely electronic softening of Coulomb correlations within V-V singlet dimers. Furthermore, this process starts 7 K (±0.3 K) below the transition temperature, as conventionally defined by electronic transport and x-ray diffraction measurements, and sets the energy scale for driving the near-room-temperature insulator-metal transition in this technologically promising material.
- Published through SciTech Connect., 03/18/2016., "slac-pub--16591", "arXiv:1503.07892", Physical Review Letters 116 11 ISSN 0031-9007; PRLTAO AM, and A. X. Gray; J. Jeong; N. P. Aetukuri; P. Granitzka; Z. Chen; R. Kukreja; D. Higley; T. Chase; A. H. Reid; H. Ohldag; M. A. Marcus; A. Scholl; A. T. Young; A. Doran; C. A. Jenkins; P. Shafer; E. Arenholz; M. G. Samant; S. S. P. Parkin; H. A. Durr.
- Funding Information:
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