Study of the low-temperature behavior of a disordered antiferromagnet with random fields by the parallel-tempering method
Abstract
The parallel-tempering method has been applied to numerically study the thermodynamic behavior of a three-dimensional disordered antiferromagnetic Ising model with random fields at spin concentrations corresponding to regions of both weak and strong structural disorder. An analysis of the low-temperature behavior of the model convincingly shows that in the case of a weakly disordered samples there is realized an antiferromagnetic ordered state, while in the region of strong structural disorder the effects of random magnetic fields lead to the realization of a new phase state of the system with a complex domain structure consisting of antiferromagnetic and ferromagnetic domains separated by regions of a spin-glass phase and characterized by a spinglass ground state.
- Publication:
-
Physics of Metals and Metallography
- Pub Date:
- December 2007
- DOI:
- 10.1134/S0031918X07120010
- arXiv:
- arXiv:0802.0072
- Bibcode:
- 2007PMM...104..541P
- Keywords:
-
- 75.10.Jm;
- 75.50.Ee;
- Condensed Matter - Disordered Systems and Neural Networks;
- Condensed Matter - Statistical Mechanics
- E-Print:
- 12 RevTeX pages, 8 figures