We obtain the axial next-nearest-neighbor Ising model from a Heisenberg model with large single-ion anisotropy energy, D, as might be relevant for helical spin systems. We treat quantum fluctuations to lowest order in 1/S at zero temperature within an expansion in J/D, where J is an exchange energy. The transition from the state with periodicity p = 4 to the uniform state ( p = ∞) occurs via a sequence of first order transitions in which p increases monotonically.
Titolo: | QUANTUM FLUCTUATIONS IN THE AXIAL NEXT-NEAREST-NEIGHBOR ISING-MODEL |
Autori: | HARRIS AB; MICHELETTI C; YEOMANS JM |
Rivista: | |
Data di pubblicazione: | 1995 |
Volume: | 74 |
Fascicolo: | 15 |
Pagina iniziale: | 3045 |
Pagina finale: | 3048 |
Digital Object Identifier (DOI): | 10.1103/PhysRevLett.74.3045 |
Appare nelle tipologie: | 1.1 Journal article |
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