Specific Heat of defects in the Haldane System Y_2BaNiO_5
Condensed Matter
2009-10-30 v1
Abstract
We calculate the specific heat of the antiferromagnetic spin-1 chain compound Y_2BaNi_{1-x}Zn_xO_5 in the presence of a magnetic field. The low-energy spectrum of a Heisenberg Hamiltonian, which includes realistic anisotropies, has been solved using the density matrix renormalization group. The observed Schottky anomaly is very well described by this theory. For large chains (), contrary to previous interpretations of the specific heat data, we find S=1/2 states. These results are thus also consistent with electron- spin-resonance data for NENP.
Keywords
Cite
@article{arxiv.cond-mat/9709111,
title = {Specific Heat of defects in the Haldane System Y_2BaNiO_5},
author = {K. Hallberg and C. D. Batista and A. A. Aligia},
journal= {arXiv preprint arXiv:cond-mat/9709111},
year = {2009}
}
Comments
4 pages, 4 figures, Latex file