Raman Scattering from Magnon Excitations in RFeO_3

概要

論文の詳細を見る
Raman scattering from one- and two-magnon excitations in various rare-earth or-thoferrites are studied. The magnetic in-plane and out-of-plane anisotropy energiesof these systems are obtained and discussed based on the two-sublattice model of ironspins. Detailed temperature dependence of the frequencies of two A':0 magnons arealso examined on YFe0, Erred., SmFe0., Er...Sm.., Fed, and Dyeed.. It is shownthat the softening behaviors of one-magnon peak frequencies are different betweenthe rotational- and abrupt-type spin-reorientation (SR) systems. This is explained bydifferent anisotropy terms which contribute to the magnon softening associated withSR transitions. The exchange interactions between the iron and rare-earth Tons areconsidered to interpret the magnon softening in the vicinity of SR temperatures. Thetemperature and polarization properties of two-magnon Raman spectra are also dis-cussed.
社団法人日本物理学会の論文
1988-12-15