Heat Capacity of Dilute Solutions of LiquidHe3INHe4at Low Tempe

On the anomalous CMN-He3 3 thermal boundary resistance

“…(32) for pure He 3, however, let us note that we can now see a possible explanation of the absence of any anomaly in dilute solutions down to 10mdeg. 3 We saw that even in a 5% mixture the "magnetic" Kapitza resistance should be of order 100 times that for pure He 3 at the same temperature. If we assume that the "phonon" term is comparable in the two cases and behaves as T-3, it is therefore quite possible that for pure He 3 the magnetic term dominates the phonon term at all temperatures below 20 mdeg (thus giving the observed linear dependence on T of the total resistance) while for solutions at all temperatures above 10 mdeg the reverse is true.…”

Specific Heat of Dilute Solutions ofHe3inHeGreywall1 1978Phys. Rev. Lett.76020View full textAdd to dashboardCite

“…The curves describe the data very well at low temperatures (in agreement with the findings of Anderson etal. 17 for T < 100 mK) and indicate that there is a relatively sharp onset for the deviations from the LP behavior near 0.25 K. This suggests that an activation energy may be involved. Thus an attempt was made to fit the data using an expression which is the sum of the LP 20 and 3 He "roton" 11 contributions.…”

Experimental techniques: Methods for cooling below 300 mK

“…*o T2 (13) in order to cool the system of spins from T = oo to T = T~ one must extract an amount of heat AQ given by i t, nAB 2 (14) …”