Phase diagram of S=1/2 XXZ chain with NNN interaction

Details Phase diagram of S=1/2 XXZ chain with NNN interaction Phase diagram of S=1/2 XXZ chain with NNN interaction

1999-09-20

arxiv.org/abs/cond-mat/9909290v1

Phys. Rev. B 61, 9453 (2000)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 2 eps figures

Scientific paper

10.1103/PhysRevB.61.9453

We study the ground state properties of one-dimensional XXZ model with next-nearest neighbor coupling alpha and anisotropy Delta. We find the direct transition between the ferromagnetic phase and the spontaneously dimerized phase. This is surprising, because the ferromagnetic phase is classical, whereas the dimer phase is a purely quantum and nonmagnetic phase. We also discuss the effect of bond alternation which arises in realistic systems due to lattice distortion. Our results mean that the direct transition between the ferromagnetic and spin-Peierls phase occur.

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