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A Landau-Ginzburg phenomenological free energy for the Edwards and Anderson spin-glass model when there is competition between spin-glass and ferromagnetic ordering is developed. This free energy obtained with the use of the n0 replication procedure is analyzed using mean-field theory and the expansion. Critical exponents for the ferromagnetic-spin-glass multicritical point are calculated in 6- dimensions. For Ising systems, =12+ (23) and =1+ (12). For XY and Heisenberg systems, these exponents are complex. This result is not fully understood. The Harris-Plischke-Zuckermann model for amorphous magnetism is shown to have an Ising-like spin-glass fixed point in high enough dimension.
Chen et al. (Thu,) studied this question.
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