Spin correlations and exchange in square lattice frustrated ferromagnets
M. Skoulatos, J.P. Goff, C. Geibel, E.E. Kaul, R. Nath, N. Shannon, B., Schmidt, A.P. Murani, P.P. Deen, M. Enderle, A.R. Wildes
TL;DR
This paper investigates the magnetic properties of square lattice frustrated ferromagnets, specifically Pb2VO(PO4)2 and SrZnVO(PO4)2, using magnetometry and neutron scattering to understand their exchange interactions and magnetic order.
Contribution
It unambiguously determines J1 and J2 exchange constants in two vanadium phosphate materials and explores their magnetic phases near the bond-nematic region.
Findings
Pb2VO(PO4)2 and SrZnVO(PO4)2 have ferromagnetic J1.
Ordered magnetic moments are reduced in the antiferromagnetic state.
Diffuse magnetic scattering increases near the bond-nematic phase.
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.
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