The isotropic Compton profile difference across the phase transition of VO2

Kari O. Ruotsalainen (), Juho Inkinen, Tuomas Pylkkänen, Thomas Buslaps, Mikko Hakala, Keijo Hämäläinen and Simo Huotari
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Kari O. Ruotsalainen: University of Helsinki
Juho Inkinen: University of Helsinki
Tuomas Pylkkänen: University of Helsinki
Thomas Buslaps: ESRF – The European Synchrotron
Mikko Hakala: University of Helsinki
Keijo Hämäläinen: University of Helsinki
Simo Huotari: University of Helsinki

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 10, 1-6

Abstract: Abstract We studied the isotropic Compton profile of the prototypical oxide VO2 across the temperature induced electronic and structural phase transition at TC ≈ 340 K. We show that the phase transition leaves an observable signal, which facilitates Compton scattering studies of electronic structure and phase transitions in complex solids in powder form. We compare the experimental results with density functional theory calculations and find agreement in the shape of the difference profile, although the amplitude of the observed features is overestimated. The origin of the disagreement is discussed and we argue that it mainly originates mostly correlation effects beyond our current calculations and possibly to some extent from thermal motion.

Date: 2018
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DOI: 10.1140/epjb/e2018-90121-x

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