| Issue |
Europhys. Lett.
Volume 58, Number 5, June 2002
|
|
|---|---|---|
| Page(s) | 718 - 724 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2002-00408-4 | |
| Published online | 01 May 2002 | |
Measurement of the 
mass diffusion coefficient in
superfluid 
over the 0.45–0.95 K temperature range
1
University of California,
Los Alamos National Laboratory, Physics Division
Los Alamos, New Mexico 87545, USA
2
Department of Physics, Simon Fraser University 8888 University
Drive, Burnaby, B.C., Canada V5A 1S6
3
Hahn-Meitner Institut - Glienicker Str. 100,
D-14109 Berlin, Germany
Received:
8
October
2001
Accepted:
8
February
2002
We have directly measured
the mass diffusion coefficient D of 3He
in superfluid 4He at temperatures
lower than were previously possible. The experimental technique
utilizes scintillation light produced when neutrons react
with 3He nuclei,
and allows measurement of the 3He density integrated along
the trajectory of a well-defined neutron beam. By measuring
the change in 3He density near a heater as a function
of applied heat current,
we are able to infer values for D
with 20% accuracy.
At temperatures below 0.7 K and for concentrations
of order 10-4, we find ![$D=\left[2.0 {+2.4 \atop -1.2}\right] T^{-(6.5\mp 1.2)}$](/articles/epl/abs/2002/11/7102/7102_tex_eq3.png)
cm2/s, in
agreement with a theoretical approximation.
PACS: 67.40.Pm – Transport processes / 67.40.Bz – Phenomenology and two-fluid models / 67.40.Yv – Impurities and other defects
© EDP Sciences, 2002
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