One- and two-magnon excitations in the antiferromagnet PbFeBO4

Article

关键词: PBMBO4 M;    MAGNETIC-PROPERTIES;    CRYSTAL-CHEMISTRY;    RAMAN-SCATTERING;    MN;    LIGHT;    FE;    CR;   

DOI  :  10.1103/PhysRevB.103.094443

来源: SCIE

【 摘 要 】

The linear spin-wave theory study of PbFeBO4 spin dynamics is presented. It is shown that the magnetic excitations previously observed in Raman scattering experiments below Ned temperature are optical magnon and two-magnon modes. Based on the magnon energy, two-magnon band line shape, and the Weiss temperature, the consistent set of the exchange coupling constants up to the third-nearest neighbor is derived and compared with the results of ab initio calculations available in the literature. The small deviation of the observed two-magnon band from the one-magnon density of states suggests a surprisingly negligible role of magnon-magnon interactions.

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