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Sereni, J. G., T. E. Huber, and C. A. Luengo. "Low temperature specific heat of Th-Gd spin glass." Solid State Communications 29, no. 9 (1979): 671–673.
Abstract: The specific heat measurements of Th---Gd alloys, with Gd concentration ranging from 0.15% to 10.8% and temperatures between 0.4 and 8 K, are reported. The characteristic spin glass specific heat enhancement and its maximum was found linearly proportional to Gd concentration. At low temperatures a T2 dependence of the specific heat was observed and the entropy associated with the magnetic ordering was the 70% of the expected value for the spin S = 7/2.