Magnetic ordering, spin waves, and Haldane gap excitations in (Ndx Y1-x)2 Ba Ni O5 linear-chain mixed-spin antiferromagnets
T. Yokoo, S. Raymond, A. Zheludev, S. Maslov, E. Ressouche, I. Zaliznyak, R. Erwin, M. Nakamura, J. Akimitsu
Abstract
Linear-chain nickelates with the composition (Ndx Y1-x)2 Ba Ni O5 (x=1, x=0.75, x=0.5, and x=0.25) are studied in a series of neutron scattering experiments. Powder diffraction is used to determine the temperature dependence of the magnetic structure in all four systems. Single-crystal inelastic neutron scattering is employed to investigate the temperature dependence of the Haldane-gap excitations and low-energy spin waves in the x=1 compound Nd2 Ba Ni O5. The results of these experiments are discussed in the context of the ``Haldane chain in a staggered field'' model for R2 Ba Ni O5 systems, and quantitative agreement with theory is obtained.
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