Abstract
An Ising model with competing interactions is used to study the appearance of incommensurate phases in the basal plane of a hexagonal-close-packed structure. The calculated mean-field phase diagram reveals various -incommensurate and lock-in phases. The results are applied to explain the basal-plane incommensurate phase in some compounds of the family, like , , , and to describe the sequence of high-temperature phase transitions in other compounds of this family.
- Received 5 August 1997
DOI:https://doi.org/10.1103/PhysRevB.57.5086
©1998 American Physical Society