Search for superfluidity of3He in3He-4He solution |
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| Authors: | Hidehiko Ishimoto Hiroshi Fukuyama Nobuhiko Nishida Yuichi Miura Yasumasa Takano Tsuneo Fukuda Tetsuro Tazaki Shinji Ogawa |
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| Affiliation: | (1) Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo, Japan;(2) Present address: Department of Physics, Tokyo Institute of Technology, Ookayama, Meguroku, Tokyo, Japan;(3) Present address: Department of Physics, Nagoya University, Chikusa-ku, Nagoya, Japan;(4) Present address: Physics Department, University of Florida, Gainesville, Florida |
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| Abstract: | We have tried to cool a3He-4He solution down to the microkelvin temperature region to search for a superfluid transition of the3He component in the solution. The contact surface area between the solution and a sintered powder has been increased enormously by the use of a fine platinum powder, to reduce the effect of the residual heat leak directly entering into the solution. Although the heat leak was found to be time dependent, the ultimate ratio of the heat leak to the surface area is about 0.046 pW/m2, improved very much from those by the other groups. But the lowest temperature of the solution is still around 0.2 mK, and no evidence of the transition has been observed yet. |
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