Abstract
The hyperfine Zeeman splitting of the Mossbauer absorption spectrum in dysprosium iron garnet is studied. The Dy/sup 1//sup 6//sup 1//sup m/ 26 kev gamma rays are absorbed at 85 and 300 deg K, and the relative absorption cross sections are measured for +12 to -12 cm/sec relative emitter-absorber velocity. The results are analyzed in terms of a 5/2 spin first excited state with opposite magnetic moment to the ground state. A large observed temperature-dependent quadrupole effect is explained in terms of alignment of the 4f electrons below the Curie temperature. (T.F.H.)
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