3He in 99.5% Porous Aerogel at the Normal-Superfluid Transition |
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| Authors: | SCJ Kingsley G Lawes A Golov K Matsumoto JV Porto EN Smith N Mulders MHW Chan JM Parpia |
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| Affiliation: | (1) Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY 14853, USA;(2) Present address: Department of Applied Physics, Tokyo Institute of Technology, 2-12-12 Oh-okayama, Meguro, Tokyo, 152, Japan;(3) Present address: Massachusetts Institute of Technology, Cambridge, MA, 02139;(4) Present address: Department of Physics and Astronomy, University of Delware, Newark, Delaware, 19716;(5) Present address: Pennsylvania State University, 104 Davey, University Park, PA, 16802 |
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| Abstract: | We have used a torsional oscillator to measure the superfluid density and dissipation near the superfluid transition of
3
He in aerogel of 99.5% porosity. We used a new cell (constructed at Penn State) for which the aerogel was grown in the pores of a  100  m silver sinter. The cell was tested with
4
He and showed no signs of the second-sound resonances that have interfered with previous torsional oscillator measurements. The measurements with
3
He, presented here, were taken at pressures of 1.34 and 4.13 bars. We observed values of 
s
/ in the T 0 limit of 0.05 and 0.14 respectively. Our measurements show an increase in the dissipation on warming through T
c
. This series of measurements is ongoing and temperature sweeps at various pressures are planned. |
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