Heat capacity of 3He in aerogel.
The heat capacity of pure 3He in low density aerogel is measured at 22.5 bars. The superfluid response is simultaneously monitored with a torsional oscillator. A slightly rounded heat capacity peak, 65 microK in width, is observed at the 3He-aerogel superfluid transition, T(ca). Subtracting the bulk 3He contribution, the heat capacity shows a Fermi-liquid form above T(ca). We can fit the heat capacity attributed to superfluid within the aerogel with a rounded BCS form accounting for 0.30 of the nonbulk fluid in the aerogel, or by assuming a substantial reduction in the superfluid order parameter. Both approaches are consistent with earlier superfluid density measurements.
He
Jizhong
J
Laboratory of Atomic and Solid State Physics and the CCMR, Cornell University, Ithaca, New York 14853-2501, USA.
Corwin
A D
AD
Parpia
J M
JM
Reppy
J D
JD