Interacting spin-wave dispersion relations of ferrimagnetic Heisenberg chains with crystal-field anisotropy
✍ Scribed by E. Solano-Carrillo; R. Franco; J. Silva-Valencia
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 318 KB
- Volume
- 150
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
We study the effect of crystal-field anisotropy on the dispersion relations of mixed-spin (S, s) alternating chains by using the interacting spin-wave theory and the density-matrix renormalization group algorithm. For the easy-plane anisotropy case we find that the spin-wave results fail to describe the ground-state properties of the systems under consideration, whereas for the easy-axis anisotropy regime the method demonstrates a surprising efficiency showing, for example for the system (S, s) = (3/2, 1/2), a discrepancy from the density-matrix renormalization group of about 0.0006% for the ground-state energy and of 2% for the sublattice magnetizations.