Roughening Induced Deconstruction in (100) Facets of CsCl Type Crystals

Details Roughening Induced Deconstruction in (100) Facets of CsCl Type Crystals Roughening Induced Deconstruction in (100) Facets of CsCl Type Crystals

1996-10-08

arxiv.org/abs/cond-mat/9610067v1

Physics

Condensed Matter

Statistical Mechanics

31 pages, 9 figures

Scientific paper

10.1103/PhysRevE.55.1331

The staggered 6-vertex model describes the competition between surface roughening and reconstruction in (100) facets of CsCl type crystals. Its phase diagram does not have the expected generic structure, due to the presence of a fully-packed loop-gas line. We prove that the reconstruction and roughening transitions cannot cross nor merge with this loop-gas line if these degrees of freedom interact weakly. However, our numerical finite size scaling analysis shows that the two critical lines merge along the loop-gas line, with strong coupling scaling properties. The central charge is much larger than 1.5 and roughening takes place at a surface roughness much larger than the conventional universal value. It seems that additional fluctuations become critical simultaneously.

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