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Optical observation of growth and melting dynamics of3He-4He mixture crystals

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Abstract

Crystals grown from 2.1% and 9.3% solutions of3 He in4He were observed in a cryostat with optical access from two orthogonal directions (above and from the side). Video films of dynamic processes were recorded at temperatures between 0.5K and 1.8K. Facetted melting of crystals (in contrast with rounded melting which is the general case) was observed below 0.75K. This is in accordance with previous experiments which showed a higher3He concentration along the edges of the crystal. We also recorded morphological growth instabilities of the 9.3% b.c.c. crystals. In the temperature region below about 0.9K where the latent heat is negative no dendritic growth was observed, which we interpret as resulting from opposing effects of temperature and concentration gradients.

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Author notes

  1. Benoit Chabaud

    Present address: CNRS, B.P. 166, 38042, Grenoble Cedex 9, France

Authors and Affiliations

  1. Physics Department, Technion-Israel Institute of Technology, 32000, Haifa, Israel

    Yoash Carmi, Inon Berent, Emil Polturak, Israel Schuster, S. G. Lipson & Benoit Chabaud

Authors
  1. Yoash Carmi
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  2. Inon Berent
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  3. Emil Polturak
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  4. Israel Schuster
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  5. S. G. Lipson
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  6. Benoit Chabaud
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Carmi, Y., Berent, I., Polturak, E. et al. Optical observation of growth and melting dynamics of3He-4He mixture crystals. J Low Temp Phys 101, 665–670 (1995). https://doi.org/10.1007/BF00753371

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  • DOI: https://doi.org/10.1007/BF00753371

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