Dielectric studies and interpretation of the first-order cooperative Jahn-Teller phase transition in DyAsO<sub>4</sub>
J H Page; S R P Smith; D R Taylor; R T Harley; J H Page; Phys. Dept., Queen's Univ., Kingston, Ont., Canada; S R P Smith; Phys. Dept., Queen's Univ., Kingston, Ont., Canada; D R Taylor; Phys. Dept., Queen's Univ., Kingston, Ont., Canada; R T Harley; Phys. Dept., Queen's Univ., Kingston, Ont., Canada
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1979-12-14
Аннотация:
The first-order Jahn-Teller phase transition in DyAsO<sub>4</sub> has been studied using precise dielectric susceptibility measurements. Discontinuities in the order parameter and the c-axis susceptibility are observed at the transition temperature. They persist in low magnetic fields but are progressively suppressed by higher fields. The data are interpreted using a molecular field model in which the ion-ion interactions are allowed to depend on the order parameter.
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