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

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.11516· OSTI ID:496731

Yokoo, T; Zheludev, A ^[1]; Nakamura, M; Akimitsu, J ^[2]

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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)

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}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 496731
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
BARIUM OXIDES
COLLECTIVE EXCITATIONS
INELASTIC SCATTERING
MAGNETIC PROPERTIES
NEODYMIUM OXIDES
NEUTRON BEAMS
NICKEL OXIDES
TEMPERATURE DEPENDENCE
YTTRIUM OXIDES