Abstract
The specific heats of Co(C 3H 4N 2) 6(NO 3) 2 and Co[C 11H 12ON 2] 6(ClO 4) 2 have been studied in the range 0. 04 < T < 1 K. No magnetic ordering is observed, indicating that the magnetic interactions are of the order of 10 -2 K or less. The observed specific heats are found to be mainly due to the hyperfine (h.f.) interactions between the Co 2+ electronic and nuclear spins. The h.f. specific heats are calculated — assuming zero magnetic exchange between the electron spins — from the h.f. constants known from E.S.R. experiments. The observed data can be accounted for within the errors by the calculated h.f. specific heats, plus a (weaker) contribution due to the magnetic dipolar interactions.
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