Inelastic neutron scattering experiments on (Formula presented) single crystals and powder samples are used to study the dynamic coupling of one-dimensional Haldane-gap excitations in the (Formula presented)-chains to local crystal-field transitions, associated with the rare earth ions. Substantial interference between the two types of excitations is observed even in the one-dimensional paramagnetic phase. Despite that, the results provide solid justification for the previously proposed “static staggered field” model for (Formula presented) nickelates. The observed behavior is qualitatively explained by a simple chain-random-phase-approximation model.
|Number of pages||12|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - Jan 1 2000|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics