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Correlation-driven insulator-metal transition in near-ideal vanadium dioxide films [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Basic Energy Sciences, 2016.
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
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Summary
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 VO2. We show that both the collapse of the insulating gap and the concomitant change in crystal symmetry in homogeneously strained single-crystalline VO2 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.
Report Numbers
E 1.99:slac-pub--16591
slac-pub--16591
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Note
Published through SciTech Connect.
03/18/2016.
"slac-pub--16591"
"arXiv:1503.07892"
Physical Review Letters 116 11 ISSN 0031-9007; PRLTAO AM
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
AC02-76SF00515
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