skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd{sub 2}BaNiO{sub 5}

Abstract

Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd{sub 2}BaNiO {sub 5} . 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 R{sub 2}BaNiO{sub 5} compounds, fails to explain new results for the longitudinal spin gap. {copyright} {ital 1999} {ital The American Physical Society}

Authors:
 [1]; ;  [2];  [3];  [4];  [5]
  1. DRFMC/SPSMS/MDN, CENG, 17 rue des Martyrs, 38054 Grenoble Cedex (France)
  2. Department of Physics, Aoyama-Gakuin University, 6-16-1, Chitosedai, Setagaya-ku, Tokyo 157 (Japan)
  3. Brookhaven National Laboratory, Upton, New York 11973-5000 (United States)
  4. Oak Ridge National Laboratory, Building 7692, MS 6393, P.O. Box 2008, Oak Ridge, Tennessee 37831 (United States)
  5. Institut Laue-Langevin, Avenue des Martyrs, Grenoble Cedex 9 (France)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
OSTI Identifier:
329721
DOE Contract Number:  
AC02-98CH10886; AC05-96OR22464
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 82; Journal Issue: 11; Other Information: PBD: Mar 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; NEODYMIUM OXIDES; BARIUM OXIDES; NICKEL OXIDES; ANTIFERROMAGNETIC MATERIALS; NEUTRON DIFFRACTION; INELASTIC SCATTERING; SPIN WAVES; ENERGY GAP; POLARIZATION

Citation Formats

Raymond, S, Yokoo, T, Akimitsu, J, Zheludev, A, Nagler, S E, and Wildes, A. Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd{sub 2}BaNiO{sub 5}. United States: N. p., 1999. Web. doi:10.1103/PhysRevLett.82.2382.
Raymond, S, Yokoo, T, Akimitsu, J, Zheludev, A, Nagler, S E, & Wildes, A. Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd{sub 2}BaNiO{sub 5}. United States. doi:10.1103/PhysRevLett.82.2382.
Raymond, S, Yokoo, T, Akimitsu, J, Zheludev, A, Nagler, S E, and Wildes, A. Mon . "Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd{sub 2}BaNiO{sub 5}". United States. doi:10.1103/PhysRevLett.82.2382.
@article{osti_329721,
title = {Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd{sub 2}BaNiO{sub 5}},
author = {Raymond, S and Yokoo, T and Akimitsu, J and Zheludev, A and Nagler, S E and Wildes, A},
abstractNote = {Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd{sub 2}BaNiO {sub 5} . 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 R{sub 2}BaNiO{sub 5} compounds, fails to explain new results for the longitudinal spin gap. {copyright} {ital 1999} {ital The American Physical Society}},
doi = {10.1103/PhysRevLett.82.2382},
journal = {Physical Review Letters},
number = 11,
volume = 82,
place = {United States},
year = {1999},
month = {3}
}