Spin correlations and exchange in square lattice frustrated ferromagnets

Abstract

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.

4 pages, 4 figures

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• Spectral evidence of a ghostly transition: Theory of NMR 1/T_1 relaxation in a quantum spin nematic in applied magnetic field
• Putative spin-nematic phase in BaCdVO(PO${}_4$)${}_2$
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• Hidden magnetic order in CuNCN
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• The double life of electrons in magnetic iron pnictides, as revealed by NMR
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• Dimensional reduction by pressure in the magnetic framework material CuF${}_2$(D${}_2$O)${}_2$pyz: from spin-wave to spinon excitations
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• Phase diagram and spin waves in the frustrated ferro-antiferromagnet SrZnVO(PO4)2
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