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Recently developed renormalization-group techniques are used to study the tetracritical (or bicritical) point of quenched mixed magnetic crystals (e. g. , AB₁-, where A and B have ferromagnetic and antiferromagnetic phase transitions). The tetracritical (bicritical) exponents are possibly given by the n=0 value of their expansions. In particular, the crossover exponent, describing the shape of the p-T phase diagram near the tetracritical point, is exactly equal to 1. This explains various experiments.
Amnon Aharony (Mon,) studied this question.
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