Abstract
We studied magnetism of using inelastic neutron scattering measurements on a powder sample. This cuprate has spin- trimer chains with interactions, where and denote two antiferromagnetic (AF) exchange interaction parameters, showing a magnetization plateau. We observed an energy gap of , which generated the magnetization plateau. The gap corresponds to singlet-triplet-like excitation of an AF dimer formed by the dominant interaction. We determined the AF exchange interaction parameters and , which can reproduce the gap value as well as the magnetization.
- Received 3 June 2007
DOI:https://doi.org/10.1103/PhysRevB.76.064431
©2007 American Physical Society