Magnetic excitations in the Kagomé staircase compounds

• Published in: Journal of magnetism and magnetic materials Vol. 310; no. 2; pp. 1334 - 1336
• Main Authors: Wilson, N.R., Petrenko, O.A., Balakrishnan, G., Manuel, P., FÅk, B.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2007; Elsevier Science
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Frustrated magnet; Kagomé; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Neutron scattering; Physics; 75.50.Dd; Kagomé; Neutron scattering; Frustrated magnet; 75.30.Ds; Nickel oxides; Spin waves; Vanadium oxides; Ferromagnetic materials; Cobalt oxides; Time-of-flight method; Neutron diffusion; Monocrystals; Inelastic scattering; Kagomé lattices; Kagome; Magnetic impurities; Frustration
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2006.10.696

Inelastic neutron scattering measurements have been performed on single crystal samples of Co 3 V 2 O 8 and Ni 3 V 2 O 8 . The magnetic system in these compounds is believed to be frustrated, as the magnetic ions ( Co 2 + with S = 3 2 and Ni 2 + with S = 1 ) adopt a buckled version of the Kagomé lattice. Magnetic excitations have been observed in both samples using a time-of-flight neutron spectrometer. The excitation spectrum is dispersive for both samples and has a considerable gap in the low-temperature phases, while the intermediate temperature phases are marked by a significant softening of the excitations energy.