Abstract
We report on specific heat measurements of liquid 3He bubbles in Ag foils as well as in a matrix of solid 4He at millikelvin temperatures. —For the first part we have implanted about 0.1% 3He in Ag foils. The foils have been annealed between 900 K and 1112 K. This resuts in high‐pressure 3He gas bubbles of diameters between about 40 A and 110 A; the 3He liquifies when the metal foils are cooled to low temperatures. After each annealing step we have measured the thermal relaxation time of the foils at 13 mK≤T≤1.2 K, and have determined in this way the specific heat of the 3He bubbles; it differs from the specific heat of bulk liquid 3He. —In the second set of experiments we have measured the specific heat of a 0.75% 3He‐4He mixture at 25.3 bar (27.1 bar) and 20 mK≤T≤300 mK; simultaneously we have measured the pressure of this mixture. Our data indicate that at the lower (higher) pressure there are bubbles of a liquid mixture (of liquid 3He) in a solid 4He matrix.
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