Abstract
Abstract We have investigated the cubic to tetragonal phase transition in RbCaF3 under [110] uniaxial stress by monitoring the EPR lines of the cubic Gd3+ centre which shift proportionaly to the square of the order parameter (the rotational anngle of the CaF6 octahedra Φ) or those of the Gd3+-O2- pair which splits linearly in Φ.
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