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: firstname.lastname@example.org
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
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