Influence of supercooling level on kinetics of phase separation in solid mixtures of super(4)He in super(3)He

We studied the kinetics of phase separation in the solid mixture of super(4)He in super(3)He at various supercooling in the temperature range of 100-200 mK through precise pressure measurements. The time dependences of the pressure change during phase separation were exponential. At small supercooli...

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Bibliographic Details
Published in:Journal of low temperature physics 2002-01, Vol.126 (1-2), p.151-156
Main Authors: Penzev, A, Ganshin, A, Grigor'ev, V, Maidanov, V, Rudavskii, E, Rybalko, A, Slezov, V, Syrnikov, Ye
Format: Article
Language:English
Subjects:
Helium
Nucleation
Phase separation
Supercooling
Surface tension
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Summary:We studied the kinetics of phase separation in the solid mixture of super(4)He in super(3)He at various supercooling in the temperature range of 100-200 mK through precise pressure measurements. The time dependences of the pressure change during phase separation were exponential. At small supercooling the characteristic time constant tau is almost independent of the final temperature T sub(f) and is about 10 hours, which is considered to result from heterogeneous nucleation. In a narrow range of T sub(f) tau decreases more than an order of magnitude. At larger supercooling tau is independent of T sub(f) again. This behaviour agrees qualitatively with the theoretical consideration of the phase separation kinetics at homogeneous nucleation taking into account the finiteness of a cooling rate. The value of interphase surface tension has been obtained from comparison of the theory with the experimental results.
ISSN:0022-2291