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Title: Structural precursor to the metal-insulator transition in V{sub 2}O{sub 3}

Abstract

The temperature dependence of the local structure of V{sub 2}O{sub 3} in the vicinity of the metal-to-insulator transition (MIT) has been investigated using hard x-ray absorption spectroscopy. It is shown that the vanadium pair distance along the hexagonal c axis changes abruptly at the MIT as expected. However, a continuous increase of the tilt of these pairs sets in already at higher temperatures and reaches its maximum value at the onset of the electronic and magnetic transition. These findings confirm recent theoretical results which claim that electron-lattice coupling is important for the MIT in V{sub 2}O{sub 3}. Our results suggest that the distortion of the symmetry of the basal plane plays a decisive role for the MIT and orbital degrees of freedom drive the MIT via changes in hybridization.

Authors:
; ; ; ;  [1];  [2]
  1. Institut fuer Physik, Universtitaet Augsburg, Universitaetsstrasse 1, 86159 Augsburg (Germany)
  2. (United States)
Publication Date:
OSTI Identifier:
20788051
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 73; Journal Issue: 14; Other Information: DOI: 10.1103/PhysRevB.73.144106; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; COUPLING; DEGREES OF FREEDOM; DISTANCE; ELECTRONS; HARD X RADIATION; PHASE TRANSFORMATIONS; PRECURSOR; SYMMETRY; TEMPERATURE DEPENDENCE; VANADIUM; VANADIUM OXIDES; X-RAY SPECTRA

Citation Formats

Pfalzer, P., Obermeier, G., Klemm, M., Horn, S., Boer, M. L. den, and Queens College of CUNY, 65-30 Kissena Boulevard, Flushing, New York 11367. Structural precursor to the metal-insulator transition in V{sub 2}O{sub 3}. United States: N. p., 2006. Web. doi:10.1103/PHYSREVB.73.1.
Pfalzer, P., Obermeier, G., Klemm, M., Horn, S., Boer, M. L. den, & Queens College of CUNY, 65-30 Kissena Boulevard, Flushing, New York 11367. Structural precursor to the metal-insulator transition in V{sub 2}O{sub 3}. United States. doi:10.1103/PHYSREVB.73.1.
Pfalzer, P., Obermeier, G., Klemm, M., Horn, S., Boer, M. L. den, and Queens College of CUNY, 65-30 Kissena Boulevard, Flushing, New York 11367. Sat . "Structural precursor to the metal-insulator transition in V{sub 2}O{sub 3}". United States. doi:10.1103/PHYSREVB.73.1.
@article{osti_20788051,
title = {Structural precursor to the metal-insulator transition in V{sub 2}O{sub 3}},
author = {Pfalzer, P. and Obermeier, G. and Klemm, M. and Horn, S. and Boer, M. L. den and Queens College of CUNY, 65-30 Kissena Boulevard, Flushing, New York 11367},
abstractNote = {The temperature dependence of the local structure of V{sub 2}O{sub 3} in the vicinity of the metal-to-insulator transition (MIT) has been investigated using hard x-ray absorption spectroscopy. It is shown that the vanadium pair distance along the hexagonal c axis changes abruptly at the MIT as expected. However, a continuous increase of the tilt of these pairs sets in already at higher temperatures and reaches its maximum value at the onset of the electronic and magnetic transition. These findings confirm recent theoretical results which claim that electron-lattice coupling is important for the MIT in V{sub 2}O{sub 3}. Our results suggest that the distortion of the symmetry of the basal plane plays a decisive role for the MIT and orbital degrees of freedom drive the MIT via changes in hybridization.},
doi = {10.1103/PHYSREVB.73.1},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 73,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}