ON THE ANISOTROPY OF EXCHANGE IN YTTERBIUM IRON GARNET.
PENNSYLVANIA UNIV PHILADELPHIA
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The exchange splittings of the lowest 2F52 and 2F72 doublets of Yb3 in YbIG are evaluated in terms of the exchange potential parameters as given in a previous article. The wave functions of White, and Hutchings and Wolf were used. A good four parameter fit of the experimental exchange splittings is obtained by adopting essentially zero values for the rare-earth-iron exchange interactions that take place through the nearest neighbor oxygen ions. The chief result of this analysis is that the rare-earth-iron exchange interaction takes place primarily through the next-nearest neighbor oxygens 2.43A the nearest neighbor oxygens 2.37A are comparatively inert. Author