We describe a new optical interferometric technique which we have applied to 3He-4He liquid mixtures in the phase separation region. The formation and slow propagation of a concentration front is observed when the phase separation equilibrium is disturbed by sudden heating. The phenomenon is analyzed in terms of a concentration-dependent diffusion constant, and the results indicate critical behavior of the diffusion constant on the normal side of the lambda line. The application of the optical method to studies of interphase surface tension and crystallization is also indicated.
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This work was supported by the U.S.-Israel Binational Science Foundation.
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Pipmant, J., Lipson, S.G., Landau, J. et al. Investigation of the dynamic behavior of 3He-4He mixtures at low temperatures using holographic interferometry. J Low Temp Phys 31, 119–142 (1978). https://doi.org/10.1007/BF00116233
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DOI: https://doi.org/10.1007/BF00116233