Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb${}_2$VO(PO${}_4$)${}_2$

Abstract

Single crystal neutron diffraction, inelastic neutron scattering and electron spin resonance experiments are used to study the magnetic structure and spin waves in Pb${}_2$VO(PO${}_4$)${}_2$, a prototypical layered $S=1/2$ ferromagnet with frustrating next nearest neighbor antiferromagnetic interactions. The observed excitation spectrum is found to be inconsistent with a simple square lattice model previously proposed for this material. At least four distinct exchange coupling constants are required to reproduce the measured spin wave dispersion. The degree of magnetic frustration is correspondingly revised and found to be substantially smaller than in all previous estimates.

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Cited by in corpus (10)

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• Realising square and diamond lattice $S=1/2$ Heisenberg antiferromagnet models in the $\alpha$ and $\beta$ phases of the coordination framework, KTi(C${}_2$O${}_4$)${}_2\cdot$\textit{x}H${}_2$O
• Inelastic neutron scattering determination of the spin Hamiltonian for BaCdVO(PO${}_4$)${}_2$
• Phase diagram and spin waves in the frustrated ferro-antiferromagnet SrZnVO(PO4)2
• Quasi two-dimensional magnetism in spin-$\frac{1}{2}$ square lattice compound Cu[C${}_6$H${}_2$(COO)${}_4$][H${}_3$N-(CH${}_2$)${}_2$-NH${}_3$]$\cdot$3H${}_2$O
• Origin of magnetic anisotropy in the spin ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Spin correlations in the frustrated ferro-antiferromagnet SrZnVO(PO4)2 near saturation
• Magnetic excitations and absence of charge order in the van der Waals ferromagnet Fe${}_{4.75}$GeTe${}_2$