Physics – Condensed Matter
Scientific paper
1995-05-04
Physics
Condensed Matter
55 pages ReVTeX (encoded with uufiles) + 17 uuencoded figures
Scientific paper
10.1103/PhysRevB.52.6684
We study the effect of quantum fluctuations on the multiphase point of the Heisenberg model with first- and second-neighbor competing interactions and strong uniaxial spin anisotropy $D$. By studying the structure of perturbation theory we show that the multiphase degeneracy which exists for $S=\infty$ (i.e., for the ANNNI model) is lifted and that the effect of quantum fluctuations is to stabilize a sequence of phases of wavelength 4,6,8,...~. This sequence is probably an infinite one. We also show that quantum fluctuations can mediate an infinite sequence of layering transitions through which an interface can unbind from a wall.
Harris Brooks A.
Micheletti Cristian
Yeomans Julia M.
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