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Title: Ni-chain gap excitations in (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5}: One-dimensional to three-dimensional crossover

Abstract

Linear-chain mixed-spin antiferromagnets (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5} were investigated by powder inelastic neutron scattering for x=0.25, 0.5, and x=0.75. Long-range magnetic ordering was observed in all samples. The temperature dependence of the Ni-chain spin-gap modes was measured and compared to previous results for the x=0 and x=1 materials. In the magnetically disordered phase the spin dynamics was shown to have a composition-independent character. The results suggest that one-dimensional gap excitations seen in the paramagnetic and N{acute e}el phases of Nd{sub 2}BaNiO{sub 5} are inherently related to Haldane spin excitations in the quantum-disordered system Y{sub 2}BaNiO{sub 5}. {copyright} {ital 1997} {ital The American Physical Society}

Authors:
;  [1]; ;  [2]
  1. Physics Department, 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)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
496731
DOE Contract Number:  
AC02-76CH00016
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 55; Journal Issue: 17; Other Information: PBD: May 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NEODYMIUM OXIDES; MAGNETIC PROPERTIES; YTTRIUM OXIDES; ANTIFERROMAGNETIC MATERIALS; BARIUM OXIDES; NICKEL OXIDES; COLLECTIVE EXCITATIONS; INELASTIC SCATTERING; NEUTRON BEAMS; TEMPERATURE DEPENDENCE

Citation Formats

Yokoo, T, Zheludev, A, Nakamura, M, and Akimitsu, J. Ni-chain gap excitations in (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5}: One-dimensional to three-dimensional crossover. United States: N. p., 1997. Web. doi:10.1103/PhysRevB.55.11516.
Yokoo, T, Zheludev, A, Nakamura, M, & Akimitsu, J. Ni-chain gap excitations in (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5}: One-dimensional to three-dimensional crossover. United States. doi:10.1103/PhysRevB.55.11516.
Yokoo, T, Zheludev, A, Nakamura, M, and Akimitsu, J. Thu . "Ni-chain gap excitations in (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5}: One-dimensional to three-dimensional crossover". United States. doi:10.1103/PhysRevB.55.11516.
@article{osti_496731,
title = {Ni-chain gap excitations in (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5}: One-dimensional to three-dimensional crossover},
author = {Yokoo, T and Zheludev, A and Nakamura, M and Akimitsu, J},
abstractNote = {Linear-chain mixed-spin antiferromagnets (Nd{sub x}Y{sub 1{minus}x}){sub 2}BaNiO{sub 5} were investigated by powder inelastic neutron scattering for x=0.25, 0.5, and x=0.75. Long-range magnetic ordering was observed in all samples. The temperature dependence of the Ni-chain spin-gap modes was measured and compared to previous results for the x=0 and x=1 materials. In the magnetically disordered phase the spin dynamics was shown to have a composition-independent character. The results suggest that one-dimensional gap excitations seen in the paramagnetic and N{acute e}el phases of Nd{sub 2}BaNiO{sub 5} are inherently related to Haldane spin excitations in the quantum-disordered system Y{sub 2}BaNiO{sub 5}. {copyright} {ital 1997} {ital The American Physical Society}},
doi = {10.1103/PhysRevB.55.11516},
journal = {Physical Review, B: Condensed Matter},
number = 17,
volume = 55,
place = {United States},
year = {1997},
month = {5}
}