Published March 1999 | Version v1
Journal article Metadata-only

Polarized-Neutron Observation of Longitudinal Haldane-Gap Excitations in Nd2BaNiO5

Creators

  • 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)

Description

Polarized and unpolarized inelastic neutron scattering is used to study Haldane-gap excitations in the mixed-spin linear-chain antiferromagnet Nd2BaNiO 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 R2BaNiO5 compounds, fails to explain new results for the longitudinal spin gap. copyright 1999 The American Physical Society

Additional details

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
82
Journal Issue
11
Journal Page Range
p. 2382-2385
ISSN
0031-9007
CODEN
PRLTAO

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
30034517
Subject category
S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ANTIFERROMAGNETIC MATERIALS; BARIUM OXIDES; ENERGY GAP; INELASTIC SCATTERING; NEODYMIUM OXIDES; NEUTRON DIFFRACTION; NICKEL OXIDES; POLARIZATION; SPIN WAVES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; DIFFRACTION; MAGNETIC MATERIALS; MATERIALS; NEODYMIUM COMPOUNDS; NICKEL COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS