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

Shaolong Ma; Collin Broholm; Daniel H. Reich; B. J. Sternlieb; R. W. Erwin

doi:10.1103/PhysRevLett.69.3571

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

Shaolong Ma, Collin Broholm, Daniel H. Reich, B. J. Sternlieb, and R. W. Erwin

Phys. Rev. Lett. 69, 3571 – Published 14 December 1992

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.

Received 19 June 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.3571

Authors & Affiliations

Shaolong Ma, Collin Broholm, Daniel H. Reich, B. J. Sternlieb, and R. W. Erwin

Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218
Department of Physics, Columbia University, New York, New York 10027
National Institute of Standards and Technology, Gaithersburg, Maryland 20899