Linear-chain nickelates with the composition (Formula presented) ((Formula presented) and (Formula presented)) are studied in a series of neutron-scattering experiments. Powder diffraction is used to determine the temperature dependence of the magnetic structure in all four systems. Single-crystal inelastic neutron scattering is employed to investigate the temperature dependence of the Haldane-gap excitations and low-energy spin waves in the (Formula presented) compound (Formula presented) The results of these experiments are discussed in the context of the “Haldane chain in a staggered field” model for (Formula presented) systems, and quantitative agreement with theory is obtained.
|Original language||English (US)|
|Number of pages||12|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 1998|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics