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Title: Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd{sub 2}BaNiO{sub 5}

Abstract

Inelastic neutron scattering experiments on Nd{sub 2}BaNiO{sub 5} single crystals and powder samples are used to study the dynamic coupling of one-dimensional Haldane-gap excitations in the S=1 Ni{sup 2+}-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 R{sub 2}BaNiO{sub 5} nickelates. The observed behavior is qualitatively explained by a simple chain-random-phase-approximation model. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [2];  [2];  [3];  [4];  [5]
  1. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. Department of Physics, Aoyama-Gakuin University, 6-16-1 Chitosedai, Setagaya-ku, Tokyo 157 Japan (Japan)
  3. Universite de Geneve DPMC 24, quai Ernest Ansermet 1211, Geneve 4, (Switzerland)
  4. Oak Ridge National Laboratory, Building 7692, MS 6393, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)
  5. Department of Physics, Tohoku University, Aramaki, Aoba-ku, Sendai 980-8578, (Japan)
Publication Date:
OSTI Identifier:
20216315
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 17; Other Information: PBD: 1 May 2000; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNETIC PROPERTIES; NIOBIUM OXIDES; BARIUM OXIDES; NICKEL OXIDES; NEUTRON DIFFRACTION; RANDOM PHASE APPROXIMATION; CRYSTAL FIELD; ANTIFERROMAGNETIC MATERIALS; INELASTIC SCATTERING; THEORETICAL DATA

Citation Formats

Zheludev, A., Maslov, S., Yokoo, T., Akimitsu, J., Raymond, S., Nagler, S. E., and Hirota, K. Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd{sub 2}BaNiO{sub 5}. United States: N. p., 2000. Web. doi:10.1103/PhysRevB.61.11601.
Zheludev, A., Maslov, S., Yokoo, T., Akimitsu, J., Raymond, S., Nagler, S. E., & Hirota, K. Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd{sub 2}BaNiO{sub 5}. United States. doi:10.1103/PhysRevB.61.11601.
Zheludev, A., Maslov, S., Yokoo, T., Akimitsu, J., Raymond, S., Nagler, S. E., and Hirota, K. Mon . "Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd{sub 2}BaNiO{sub 5}". United States. doi:10.1103/PhysRevB.61.11601.
@article{osti_20216315,
title = {Role of single-ion excitations in the mixed-spin quasi-one-dimensional quantum antiferromagnet Nd{sub 2}BaNiO{sub 5}},
author = {Zheludev, A. and Maslov, S. and Yokoo, T. and Akimitsu, J. and Raymond, S. and Nagler, S. E. and Hirota, K.},
abstractNote = {Inelastic neutron scattering experiments on Nd{sub 2}BaNiO{sub 5} single crystals and powder samples are used to study the dynamic coupling of one-dimensional Haldane-gap excitations in the S=1 Ni{sup 2+}-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 R{sub 2}BaNiO{sub 5} nickelates. The observed behavior is qualitatively explained by a simple chain-random-phase-approximation model. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevB.61.11601},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 17,
volume = 61,
place = {United States},
year = {2000},
month = {5}
}