3He melting pressure temperature scale below 25 mK |
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| Authors: | W. Ni J. S. Xia E. D. Adams P. S. Haskins J. E. McKisson |
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| Affiliation: | (1) Department of Physics and Center for Ultralow Temperature Research, University of Florida, 32611 Gainesville, FL;(2) Institute for Space Science and Technology, 32609 Gainesville, FL;(3) Department of Chemistry, University of Puerto Rico, PO Box 23346, PR 00931 Rio Piedras |
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| Abstract: | Using60Co  -ray anisotropy radiation as a primary thermometer, with a Pt NMR susceptibility secondary thermometer, we have made high-precision measurements of the3He melting pressure versus temperature from 500  K to 25 mK. Temperatures obtained for the fixed points on the melting curve are: the superfluid A transition TA = 2.505mK, the A-B transition TAB = 1.948 mK, and the solid ordering temperature TN = 0.934 mK. We provide a functional form for P(T), which, with the fixed points, constitutes a convenient temperature scale, based on a primary thermometer, usable to well below 1 mK. |
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