Phase diagram of the 3D Axial-Next-Nearest-Neighbor Ising model

Details Phase diagram of the 3D Axial-Next-Nearest-Neighbor Ising model Phase diagram of the 3D Axial-Next-Nearest-Neighbor Ising model

2002-10-17

arxiv.org/abs/cond-mat/0210356v3

Phys. Rev. B 71 (2005) 024404

Physics

Condensed Matter

Statistical Mechanics

8 pages, 12 figures, RevTeX4 format

Scientific paper

10.1103/PhysRevB.71.024404

The three-dimensional axial-next-nearest-neighbor Ising (ANNNI) model is studied by a modified tensor product variational approach (TPVA). A global phase diagram is constructed with numerous commensurate and incommensurate magnetic structures. The devil's stairs behavior for the model is confirmed. The wavelength of the spin modulated phases increases to infinity at the boundary with the ferromagnetic phase. Widths of the commensurate phases are considerably narrower than those calculated by mean-field approximations.

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