Lattice gas model with competing interactions: hard walls, dimerisation and a new melting mechanism
- 1 February 1984
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 17 (2) , L61-L66
- https://doi.org/10.1088/0305-4470/17/2/007
Abstract
The authors study the low temperature phases of the two-dimensional ANNNI model in an external field. A new type of melting mechanism due to hard walls is found and special Lifshitz-type multicritical points are predicted. For strong attraction between elementary units of different periodicity the dimerisation process leads to a phase diagram typical for an XXZ chain.Keywords
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