Phase diagram and spin waves in the frustrated ferro antiferromagnet SrZnVO PO4 2

Single crystals of the frustrated S 1 2 ferro antiferromagnetic proximate square lattice material SrZnVO PO4 2 are studied in magnetometric, calorimetric, neutron diffraction, and inelastic neutron scattering experiments. The measured spin wave spectrum reveals a substantial degree of magnetic frustration and a large quantum renormalization of the exchange constants. The H amp; 8722;T magnetic phase diagram is established. It features a novel presaturation phase, which appears for only one particular field orientation. The results are discussed noting the similarities and differences with the previously studied and similarly structured Pb2VO PO4 2 compoun