Volume 43, Number 1, July I 1998
|Page(s)||77 - 82|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Competing exchange interactions in
Laboratorium für Neutronenstreuung, Eidgenössische Technische
Hochschule Zürich Paul Scherrer Institut - CH-5232 Villigen PSI, Switzerland
2 Department of Physics, University of Warwick - Coventry, UK
3 Institut Laue-Langevin, Av. des Martyrs - B.P. 156, F-36000 Grenoble, France
4 Brookhaven National Laboratory - Upton NY 11973, USA
5 Department of Superconductivity, University of Tokyo - Tokyo 113, Japan
Accepted: 19 May 1998
The dispersion of the spin-waves in single crystals of has been investigated by means of inelastic neutron scattering. The results yield a single spin-wave branch characterized by a large gap at the zone centre due to easy-axis uniaxial anisotropy. Linear spin-wave theory is used to obtain the exchange integrals in this material. It turns out that the nearest-neighbor exchange interactions in the basal plane are antiferromagnetic leading to frustration between the magnetic moments. Our results show that is an S=1/2 antiferromagnetic insulator with competing interactions.
PACS: 75.25.+z – Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) / 75.30.Ds – Spin waves / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, 1998
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.