Abstract
The unusual magnetic properties of a novel low-dimensional quantum ferrimagnet are studied using bulk methods, neutron diffraction, and inelastic neutron scattering. It is shown that this material can be described in terms of two low-dimensional quantum spin subsystems, one gapped and the other gapless, characterized by two distinct energy scales. Long-range magnetic ordering observed at low temperatures is a cooperative phenomenon caused by weak coupling of these two spin networks.
- Received 20 April 2004
DOI:https://doi.org/10.1103/PhysRevLett.93.077202
©2004 American Physical Society