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Physical Review B
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=∞ (i.e., for the axial next-nearest-neighbor Ising 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, A., Micheletti, C., & Yeomans, J. M. (1995). Lifting of Multiphase Degeneracy by Quantum Fluctuations. Physical Review B, 52 (9), 6684-6705. http://dx.doi.org/10.1103/PhysRevB.52.6684
Date Posted: 12 August 2015
This document has been peer reviewed.