Abstract

Abstract A light scattering study of Cr3B7O13Cl at temperatures near Tc has provided evidence for both displacive and disorder-order behaviour. The primary (soft mode) and secondary (optic mode) order parameters have a related but different temperature dependence from the disorder-order parameter, indicating they arise from different atomic movements. An intense central peak is observed whose temperature dependence resembles the specific heat anomaly in isomorphous Ni3B7O13Cl.

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