Abstract
A Monte Carlo simulation is performed of a Heisenberg model with nearest-neighbor antiferromagnetic interaction. It is carried out on a fcc lattice of size unit cells, where ( spins), with a fraction () of the sites occupied by spins. This model which is random for , on a frustrated lattice, is related to nonconducting spinglasses, such as . For , we calculated the following quantities: (i) the specific heat , (ii) , and (iii) the relaxation time () associated with . For , a singularity in versus the temperature seems to develop at , which becomes sharper as becomes larger, and seems to diverge as also. Furthermore, additional results for systems of cells ( spins) for , show that the peak in becomes rounded as decreases. For , seems to be smooth in and independent of , and which indicates that there is no transition for . Thus this model seems to lack some essential ingredient to describe the paramagnetic to spin-glass transition seen experimentally in systems such as .
- Received 11 May 1982
DOI:https://doi.org/10.1103/PhysRevB.27.4274
©1983 American Physical Society