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Phenomenological theory of the transitions in the (P(CH3)4)2(CuCl4)0.88(CuBr4)0.12 solid solution

A theoretical interpretation of the transition sequences in the (P(CH3)4)2 (CuCl4)1-x(CuBr4)x solid solution is proposed. Each pure compound (P(CH3)4)2CuCl4 and (P(CH3)4)2CuBr4 presents its own transition sequence which contains an incommensurate phase and different locked phases. In the solid solution with x=0.12, phases characteristic of the two pure compounds are observed in the sequence. The interpretation of this phase diagram is based on a coupling of the two order parameters, each of them corresponding to their own phonon branch. This coupling results in a re-entrant symmetry for one of the two order parameters, in agreement with experimental data.