Abstract
A new ..gamma..-ray anisotropy thermometer which may ultimately be capable of primary thermometry from > or =1 K down to approx.30 mK is reported. The thermometer is a dilute solid solution, approx.0.1 at %, of /sup 166m/Ho in gold. Two different sample preparation schemes and other relevant details are discussed. The anisotropy of the 712-keV ..gamma..-ray as a function of B and T is presented. The interpretation of the anisotropy in terms of the crystal field, electronic Zeeman, and hyperfine interaction is discussed. It is concluded that incorrect crystal field parameters for HoAu are the reason for the discrepancy between theory and experiment. Relaxation effects are briefly considered.
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