Phase Transition of Superfluid 3He in Aerogel |
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Authors: | Ryusuke Kado Hisashi Nakagawa Ken Obara Hideo Yano Osamu Ishikawa Tohru Hata |
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Affiliation: | (1) Graduate School of Science, Osaka City University, Osaka 558-8585, Japan;(2) Metrology Institute of Japan, Advanced Industrial Science and Technology, Tsukuba 305-8563, Japan |
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Abstract: | We have studied phase transition of superfluid 3He in 97.5% porosity aerogel by NMR method. Above 1.0 MPa, superfluid phase transition has been observed. The transition temperature
T
c
a
is strongly suppressed from its bulk value. The Pressure-Temperature diagram suggests that superfluid phase will not appear
below near 0.8 MPa. The A-B phase transition has been observed above 1.3 MPa, below which a state of superfluid phases remains
to be identified. The temperature dependence of NMR frequency shifts Δf in the A-like and the B-like phases are almost linear at pressures below 2.4 MPa. We obtained the differential coefficient
of NMR frequency shifts ∂(Δf)/∂(T/T
c
a
) at 0.9T
c
a
as a function of pressure, and it suggests that superfluid phase will not appear below near 0.8 MPa which is the same pressure
estimated by P-T diagram. |
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Keywords: | 67 57 -z 67 57 Pq 67 57 Jd |
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