Spin correlations and exchange in square lattice frustrated ferromagnets

Details Spin correlations and exchange in square lattice frustrated ferromagnets Spin correlations and exchange in square lattice frustrated ferromagnets

2009-09-03

arxiv.org/abs/0909.0702v1

Europhys. Lett. 88 57005 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1209/0295-5075/88/57005

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 J2/J1. 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.

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