Abstract
For a spherical single crystal of CeMg nitrate containing Co 60 cooled by adiabatic demagnetization from 24 kOe/°K, the gamma ray anisotropy ϵ is quite low (7%) compared to that for isomorphous CeZn nitrate under comparable conditions (26%). In order to understand this apparently paradoxical behavior we have carried through a calculation of ϵ in which cerium-cobalt spin-spin interactions are represented by a local magnetic field H i . A digital computer diagonalized the 22 × 22 matrix of the spin Hamiltonian 1 2 ,H i + AI zS z + 1 2 B(I +S − + I −S +) with magnetic resonance parameters appropriate for X-sites in the crystal lattice, giving the exact eigenvalues and eigenfunctions from which the angular distribution of gamma radiation has been calculated. An agreement within 2% can be obtained with 2 3 of the Co 60 nuclei in X-sites and 1 3 in Y-sites if H i = 165 Oe, as in CeZn nitrate, and if 1 T = 950 rather than 325, in accordance with recent work on the CeMg nitrate temperature scale for a sphere. Possible sources of the remaining discrepancy are discussed.
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