Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803004 | Journal of Magnetism and Magnetic Materials | 2009 | 7 Pages |
Abstract
We investigate the effect of frustration on spin-wave excitation spectra and the properties of the quasi-one-dimensional Heisenberg chain using a spin-wave-wave analysis, the exact diagonalization method and the density matrix renormalization group method. The results show that frustration can cause the softening of the acoustic excitation spectrum Ï3, as well as the hardening of the optical excitation spectrum Ï1. As a function of the frustration parameter α, the phase diagram exhibits a ferromagnetic phase, a narrow canted phase and a singlet phase. The results obtained from numerical methods show that the spin gap obviously opens and the tetramer-dimer state dominates the properties of the ground state in the singlet phase.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Jian-Jun Jiang, Yong-Jun Liu, Song-Jun Zhang, Cui-Hong Yang,