Dominance of long-lived excitations in the antiferromagnetic spin-1 chain NENP

14 December 1992

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 69 (24) , 3571-3574
https://doi.org/10.1103/physrevlett.69.3571

Abstract

We have measured the dynamic spin correlation function for the quasi-one-dimensional S=1 antiferromagnet NENP by inelastic magnetic neutron scattering. Long-lived excitations (ωτ>10) exist for 0.3π≤q̃≤π, and within error exhuast the total moment sum rule. The dispersion relation retains the fundamental periodicity of the spin chain, explicitly demonstrating the absence of broken translational symmetry in the ground state. The instantaneous spin correlation function follows a square-root Lorentzian for q̃≃π but deviates substantially from this form for q̃<0.8π.

Keywords

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