Real-space investigation of structural changes at the metal-insulator transition in VO2.
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.
Corr
Serena A
SA
School of Physical Sciences, University of Kent, Canterbury, Kent CT2 7NH, United Kingdom. s.a.corr@kent.ac.uk
Shoemaker
Daniel P
DP
Melot
Brent C
BC
Seshadri
Ram
R