Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb2VO(PO4)2.

  title={Magnetic structure and spin waves in the frustrated ferro-antiferromagnet Pb2VO(PO4)2.},
  author={S. Bettler and Florian Landolt and {\"O}mer M. Aksoy and Z. Yan and S. Gvasaliya and Yiming Qiu and Eric Ressouche and Ketty Beauvois and St{\'e}phane Raymond and A. N. Ponomaryov and Sergei A. Zvyagin and Andrey Zheludev},
  journal={Physical review. B},
  volume={99 18}
Single crystal neutron diffraction, inelastic neutron scattering, and electron spin resonance experiments are used to study the magnetic structure and spin waves in Pb2VO(PO4)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… 

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