The three-dimensional three-state Potts ferromagnet exposed to random fields: evidence for a second order transition |
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Authors: | K Eichhorn K Binder |
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Institution: | 1. Institut für Physik, Johannes Gutenberg Universit?t Mainz, Staudinger Weg 7, D-55099, Mainz, Germany
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Abstract: | Using large scale Monte Carlo simulations, the ordering of the three-dimensional three state Potts ferromagnet exposed to
random fields is investigated. Studies of the order parameter probability distribution and of various of its moments suggest
that the order of the transition depends on the strength of the random field: i.e., the first order transition of the pure
ferromagnetic model persists for weak random fields, but turns into a second order transition for a range of random fields
of medium strength. For large random fields the transition seems to be first order again. In this range large domains of strongly
aligned Potts spins occur already in the disordered phase and the associated slow relaxation hampers significantly the Monte
Carlo study of thermodynamic equilibrium phenomena. These results are discussed in the light of current theoretical concepts.
Possible applications to experiments on diluted anisotropic molecular crystals and orientational glasses are briefly mentioned. |
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