ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The hyperfine energy levels of 167Er in Er(OH)3 have been deduced using the crystal field parameters and wave functions obtained from an analysis of the experimental results of magnetic susceptibilities, their anisotropies, and optical absorption spectra of pure Er(OH)3. The hyperfine splitting of the energy levels corresponding to the ground (Ig =7/2) and first excited (Ie =9/2) 79.32-keV nuclear manifolds of 167Er in Er(OH)3 are 0.124 and 0.152 cm−1, respectively. The expected Mössbauer spectra were also predicted. No experimental data is available for comparison. The width of Mössbauer spectra for 166Er in Er(OH)3 was found to be 10.56 mm/s, which is close to the reported value. The Mössbauer spectra of 151Eu(OH)3 was studied between 300 and 4.2 K and the results were compared with the spectra calculated using similar magnetic and optical data of Eu(OH)3. The observed isomer shift (with respect to EuF3) remained temperature independent, having a value of 1.04±0.02 mm/s. The nuclear specific heat (Chf) was calculated for the 151Eu isotope in Eu(OH)3 and it showed a peak at about 0.9 mK. It was observed that Chf varied as 1/T2 between 1 K and 10 mK, which is a property that may be utilized in millikelvin thermometry.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.340323
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