Real space investigation of structural changes at the metal-insulator transition in VO2

Details Real space investigation of structural changes at the metal-insulator transition in VO2 Real space investigation of structural changes at the metal-insulator transition in VO2

2010-06-04

arxiv.org/abs/1006.0958v1

Phys. Rev. Lett. 105, 056404 (2010) [4 pages]

Physics

Condensed Matter

Materials Science

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.105.056404

Synchrotron X-ray total scattering studies of structural changes in rutile VO2 at the metal-insulator transition temperature of 340 K reveal that monoclinic and tetragonal phases of VO2 coexist in equilibrium, as expected for a first-order phase transition. No evidence for any distinct intermediate phase is seen. Unbiased local structure studies of the changes in V--V distances through the phase transition, using reverse Monte Carlo methods, support the idea of phase coexistence and point to the high degree of correlation in the dimerized low-temperature structure. No evidence for short range V--V correlations that would be suggestive of local dimers is found in the metallic phase.

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