Magnetic excitations in (VO)HPO4 x (1/2)H2O

摘要

The magnetic excitations of an antiferromagnetic spin dimer system, (VO)HPO4 x (1/2)H2O, are examined using inelastic neutron scattering. A dispersionless mode is found, consistent with expectations for a dimer excitation. The intensity variation of the mode reveals a V(4+) - V(4+) dimer separation of 4.43 angstroms, almost 50% larger than the originally expected length.