Abstract
One-dimensional Heisenberg antiferromagnets of integer spin have disordered ground states with non-zero excitation gaps. A simple Landau-Ginsburg theory for Haldane gap antiferromagnets is presented. It is then used to discuss recent magnetisation and neutron scattering experiments on the quasi-one-dimensional antiferromagnet Ni(C 2 H 8 N 2 ) 2 NO 2 ClO 4 (NENP).
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