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Phys. Rev. B 61, 11601–11612 (2000)

Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd2BaNiO5

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A. Zheludev and S. Maslov
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973

T. Yokoo and J. Akimitsu
Department of Physics, Aoyama-Gakuin University, 6-16-1 Chitosedai, Setagaya-ku, Tokyo 157 Japan

S. Raymond
Université de Geneve DPMC 24, quai Ernest Ansermet 1211, Geneve 4, Switzerland

S. E. Nagler
Oak Ridge National Laboratory, Building 7692, MS 6393, P.O. Box 2008, Oak Ridge, Tennessee 37831

K. Hirota
Department of Physics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, Japan

Received 21 October 1999; published in the issue dated 1 May 2000

Inelastic neutron scattering experiments on Nd2BaNiO5 single crystals and powder samples are used to study the dynamic coupling of one-dimensional Haldane-gap excitations in the S=1 Ni2+-chains to local crystal-field transitions, associated with the rare earth ions. Substantial interference between the two types of excitations is observed even in the one-dimensional paramagnetic phase. Despite that, the results provide solid justification for the previously proposed “static staggered field” model for R2BaNiO5 nickelates. The observed behavior is qualitatively explained by a simple chain-random-phase-approximation model.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.11601
DOI:
10.1103/PhysRevB.61.11601
PACS:
75.40.Gb, 75.30.Ds, 75.50.-y, 75.50.Ee
 
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