Non-equivalence of ensembles in the ground state of a model with annealed bond impurities

B.M. Mulder

Physica A: Statistical Mechanics and its Applications, 1991, vol. 174, issue 2, 504-516

Abstract: We analyze a model, due to Kasai and Syozi, of annealed ferromagnetic bond impurities in an antiferromagnetic host. We show that on all bi-partite lattices the usual grand-canonical approach to treating the average over the impurity configurations leads to a different ground state than the one obtained in the fixed impurity concentration (canonical) ensemble. This difference is caused by a condensation/anti-condensation phenomenon that occurs when the system is in contact with an impurity bath at fixed chemical potential. This phenomenon is illustrated by a complete solution of the model on the Bethe lattice.

Date: 1991
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:174:y:1991:i:2:p:504-516

DOI: 10.1016/0378-4371(91)90345-D

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