Abstract
ESR, paramagnetic susceptibility, and adiabatic demagnetization studies of single crystals of MgO doped with about 0.14 % Mn2+ are presented. The results of the ESR measurements are in good agreement with that obtained by previous investigators on crystals with lower Mn2+ concentration, but the line widths observed are much wider. Also, the line widths are wider by 20 % at 4.2°K than those at room temperature. The paramagnetic susceptibility obeys Curie's law very accurately down to 0.3°K and may be used for thermometry down to 0.1°K. The crystal has a maximum specific heat between 0.03 and 0.04°K. Temperatures well below 0.1°K can be attained by adiabatic demagnetization with a moderate field at 1.3°K.
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