Abstract
The field-induced magnetic order in the singlet-ground-state system has been studied by the measurements of the magnetization (the ferromagnetic component along the axis) and the magnetic neutron scattering from (the antiferromagnetic component in the plane). The field dependence of has clearly shown that the field-induced ordered phase is described by the order parameter . The development of the spin correlation and the incommensurate-commensurate phase transition have been observed in the field region of , and the comparison has been made with the phase boundary at . Two possible magnetic configurations have been suggested for the commensurate three dimensional long-ranged order phase. The frustration and the magnetostriction effects have been discussed.
- Received 19 October 2003
DOI:https://doi.org/10.1103/PhysRevB.71.224426
©2005 American Physical Society