Bettler S, Landolt F, Aksoy Ö M, Yan Z, Gvasaliya S, Qiu Y, Ressouche E, Beauvois K, Raymond S, Ponomaryov A N, Zvyagin S A, Zheludev A
Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland.
NIST Centre for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20878, USA.
Phys Rev B. 2019;99(18). doi: 10.1103/physrevb.99.184437.
Single crystal neutron diffraction, inelastic neutron scattering, and electron spin resonance experiments are used to study the magnetic structure and spin waves in PbVO(PO), a prototypical layered 12 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.
单晶中子衍射、非弹性中子散射和电子自旋共振实验被用于研究PbVO(PO)中的磁结构和自旋波，PbVO(PO)是一种典型的层状铁磁体，具有令人沮丧的次近邻反铁磁相互作用。发现观测到的激发光谱与先前为该材料提出的简单方形晶格模型不一致。需要至少四个不同的交换耦合常数来重现测量的自旋波色散。相应地修正了磁阻挫程度，发现其比之前所有估计都要小得多。
