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(C${}_2$H${}_8$N${}_2$)${}_2$NO${}_2$ClO${}_4$ (NENP).

arXiv comment18 pages and 6 figs not included available by ftp, plain TeX, SPhT/93-043

References in corpus (1)

• Dynamical Properties of a Haldane Gap Antiferromagnet

Cited by in corpus (15)

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• ESR study of the spin ladder with uniform Dzyaloshinskii-Moria interaction
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• A Near-Ideal Molecule-Based Haldane Spin-Chain
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• Low-energy magnetic excitations in the quasi-one-dimensional spin-1 chain compound SrNi2V2O8
• Modes of magnetic resonance of S=1 dimer chain compound NTENP
• Electronic structure and magnetic properties of the strong-rung spin-1 ladder compound Rb${}_3$Ni${}_2$(NO${}_3$)${}_7$
• Field theory analysis of S=1 antiferromagnetic bond-alternating chains in the dimer phase
• Microscopic Study on Superexchange Dynamics of Composite Spin-1 Bosons