Abstract
The diffuse scattering above T c was studied in CsCuCl 3 and CsCrCl 3 by neutron scattering technique. These compounds undergo phase transitions associated with the Jahn-Teller effect. Their structures are characterized by isolated chains of face sharing CuCl 6 and CrCl 6 octahedra, respectively. The diffuse scattering shows two main features: it does not occur at the superllatice points of the low temperature phase, but is centred around the strong Bragg points, and its shape changes from one Bragg point to another. This behaviour, which is incompatible with critical scattering from intra-chain correlations of Jahn-Teller distorted octahedra, can be interpreted as “dense impurity” Huang scattering.
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