Observation of the "burst-like growth" regime for the $^4$He crystals nucleated in a metastable liquid

TL;DR

This paper reports the observation of a burst-like growth regime in $^4$He crystals, confirming that similar physical mechanisms govern facet growth transitions at various temperatures, with detailed analysis of growth kinetics.

Contribution

It provides experimental evidence of burst-like growth in $^4$He crystals and links the relaxation of growth coefficients to elastic properties, revealing a drastic crossover in growth regimes.

Findings

Confirmed burst-like growth in $^4$He crystals with defects.

Established the relation between growth coefficient relaxation and elastic modulus.

Identified a sharp transition from fast to slow growth regimes.

Abstract

The "burst-like growth" regime is observed for the $^4$He crystals with the growth defects. The observation has confirmed the hypothesis for the same physical mechanisms responsible for the transition of the crystalline facets to the state of abnormally fast growth at high and low temperatures. The relaxation process of the kinetic growth coefficient is found to be similar to the relaxation of the elastic modules of the crystal at the end of the fast growth stage. The kinetic growth coefficients are determined at the stages of fast and slow growth. The crossover from the fast to slow kinetics of crystal facet growth is found to be drastic