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Antiferromagnetic spin-wave states in a linear chain with nearest- and next-nearest-neighbour interactions

Ananthakrishna, G (1975) Antiferromagnetic spin-wave states in a linear chain with nearest- and next-nearest-neighbour interactions. In: Journal of Physics C: Solid State Physics, 8 (5). 717 -722.

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Official URL: http://www.iop.org/EJ/abstract/0022-3719/8/5/017

Abstract

The spectrum of short-closed chains up to N=12 are studied by exact diagonalization to obtain the spin-wave spectrum of the Hamiltonian H=2J Sigma i=1Nsi.si+1+2J alpha Sigma i=1Nsi.si+2, -1.0<or= alpha <or=1.0 with J<0. The spin-wave spectrum is fairly well described for small alpha by the spin-wave formula obtained by the Anderson approximation (1952). The results of short chains indicate that S=0 bound magnon states lie partly below the spin-wave states with S=1 only for alpha >or=0.3 and alpha <or=-0.5. A few remarks are made concerning the low-lying excitations.

Item Type: Journal Article
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Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Oct 2009 09:19
Last Modified: 19 Sep 2010 05:49
URI: http://eprints.iisc.ernet.in/id/eprint/24188

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