Abstract
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 replication procedure is analyzed using mean-field theory and the expansion. Critical exponents for the ferromagnetic-spin-glass multicritical point are calculated in dimensions. For Ising systems, and . For 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.
- Received 7 September 1976
DOI:https://doi.org/10.1103/PhysRevB.16.2106
©1977 American Physical Society