S. Utterback, R.L. Melcher
Journal of Applied Physics
The temperature dependence of the elastic constant 12(c11-c12) shows that the B1g acoustic phonon branch is the soft mode at the cooperative Jahn-Teller phase transition in DyVO4. For T>2T D (T D is the transition temperature) the data can be described by mean field theory and show that the dominant driving mechanism for the transition is the coupling of the Jahn-Teller ions to the static elastic strain. However, for T D<T<2T D we find significant deviations from mean field theory due to critical fluctuations. © 1972 The American Physical Society.
S. Utterback, R.L. Melcher
Journal of Applied Physics
Gerald Burns, B.A. Scott
Solid State Communications
D.M. Newns, T. Doderer, et al.
Journal of Electroceramics
D.F. O'Kane, G. Burns, et al.
JES