Volume 88, Number 5, December 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 December 2009|
Spin correlations and exchange in square-lattice frustrated ferromagnets
Helmholtz Centre Berlin for Materials and Energy - Hahn-Meitner-Platz 1, 14109 Berlin, Germany, EU
2 Department of Physics, Royal Holloway, University of London - Egham, Surrey TW20 0EX, UK, EU
3 Max-Planck Institute for Chemical Physics of Solids - Nöthnitzer Str. 40, Dresden 01187, Germany, EU
4 H.H. Wills Physics Laboratory, University of Bristol - Bristol BS8 1TL, UK, EU
5 Institut Laue-Langevin - BP 156X, 38042 Grenoble Cedex, France, EU
Corresponding author: email@example.com
Accepted: 12 November 2009
The J1-J2 model on a square lattice exhibits a rich variety of different forms of magnetic order that depend sensitively on the ratio of exchange constants . We use bulk magnetometry and polarized neutron scattering to determine J1 and J2 unambiguously for two materials in a new family of vanadium phosphates, Pb2VO(PO4)2 and SrZnVO(PO4)2, and we find that they have ferromagnetic J1. The ordered moment in the collinear antiferromagnetic ground state is reduced, and the diffuse magnetic scattering is enhanced, as the predicted bond-nematic region of the phase diagram is approached.
PACS: 75.30.Et – Exchange and superexchange interactions / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.) / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EPLA, 2009
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.