Roughening and preroughening in the six vertex model with an extended range of interaction

Details Roughening and preroughening in the six vertex model with an extended range of interaction Roughening and preroughening in the six vertex model with an extended range of interaction

1995-07-06

arxiv.org/abs/cond-mat/9507014v2

Phys. Rev. B 53 126 (1996)

Physics

Condensed Matter

25 pages in RevTeX 3.0, seven uuencoded postscript figures, REPLACED because of submission error (figures were not included)

Scientific paper

10.1103/PhysRevB.53.126

We study the phase diagram of the BCSOS model with an extended interaction range using transfer matrix techniques, pertaining to the (100) surface of single component fcc and bcc crystals. The model shows a 2x2 reconstructed phase and a disordered flat phase. The deconstruction transition between these phases merges with a Kosterlitz-Thouless line, showing an interplay of Ising and Gaussian degrees of freedom. As in studies of the fully frustrated XY model, exponents deviating from Ising are found. We conjecture that tri-critical Ising behavior may be a possible explanation for the non-Ising exponents found in those models.

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