TY - JOUR
T1 - Polarized-neutron study of longitudinal haldane-gap excitations in Nd2BaNiO5
AU - Raymond, S.
AU - Yokoo, T.
AU - Zheludev, A.
AU - Nagler, S. E.
AU - Wildes, A.
AU - Akimitsu, J.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1999
Y1 - 1999
N2 - Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap.
AB - Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO5. The longitudinal mode, polarized along the direction of ordered moments, is observed for the first time. The model of isolated Haldane chains in a static staggered exchange field, that is known to work very well for static properties and transverse spin excitations in R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap.
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U2 - 10.1103/PhysRevLett.82.2382
DO - 10.1103/PhysRevLett.82.2382
M3 - Article
AN - SCOPUS:0000698006
SN - 0031-9007
VL - 82
SP - 2382
EP - 2385
JO - Physical Review Letters
JF - Physical Review Letters
IS - 11
ER -