Brillouin scattering study of the cubic tetracyanoethylene

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Abstract
The authors report measurements of the elastic and photoelectric constants of TCNE cubic phase which is the phase stable at low temperature, whereas the high-temperature phase is monoclinic. The elastic constants have been studied between 100K and the transition temperature (292K). Their behaviour does not show any precursor sign of this transition. Room-temperature elastic constants are compared with the values obtained from atom-atom potential calculations and are found to be in good agreement, whereas the point dipole model fails in the quantitative description of the photoelastic properties of TCNE.