Magnetic Field Behaviour of a Haldane Gap Antiferromagnet
Abstract
We investigate the magnetic field behaviour of an antiferromagnetic Heisenberg spin-1 chain with the most general single-ion anisotropy. We discuss the regime in which the magnetic field is below the transition value. The splitting of the Haldane triplet is obtained as a function of a field applied in an arbitrary orientation by means of a Lancz\H os exact diagonalization of chains of up to 16 spins. Our results are nicely summarized in terms of a first-order perturbation theory. We explain various level crossings that occur by the existence of discrete symmetries. A discussion is given of the electron spin resonance and neutron scattering experiments on the compound Ni(CHN)NOClO (NENP).
Keywords
Cite
@article{arxiv.cond-mat/9304041,
title = {Magnetic Field Behaviour of a Haldane Gap Antiferromagnet},
author = {O. Golinelli and Th. Jolicoeur and R. Lacaze},
journal= {arXiv preprint arXiv:cond-mat/9304041},
year = {2009}
}
Comments
18 pages and 6 figs not included available by ftp, plain TeX, SPhT/93-043