We have observed the appearance of (110) facets on b.c.c. 3 He crystals at 0.08 K. This roughening temperature is consistent with an estimate of the surface stiffness and the universal relation from the critical theory of roughening. We also present a qualitative description of the various instabilities which occur in our experimental conditions (dendrites, needle and tip oscillating crystals, cellular instabilities) and discuss the effect of the roughening transition on these instabilities.
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Rolley et al. (1986) studied this question.
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