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Journal of Low Temperature Physics

, Volume 162, Issue 5–6, pp 399–406 | Cite as

Dynamical Transition of 4He Crystallization in a Very High Porosity Aerogel

  • Ryota Masumoto
  • Ken-ichi Ueno
  • Hirofumi Matsuda
  • Ryuji Nomura
  • Yuichi Okuda
Article

Abstract

Crystallization of 4He in aerogels of 90 and 96% porosities shows a dynamical phase transition at around 600 mK due to the competition between thermal fluctuation and disorder: crystals grow via creep at high temperatures and via avalanche at low temperatures. In a very high porosity 99.5% aerogel, however, the transition had not been observed in our previous publication (Nomura et al. in Phys. Rev. Lett. 101:175703, 2008). We improved the spatial resolution of the video image and found that the 99.5% aerogel did have the transition at around 200 mK, which is much lower than those of the lower porosities. The avalanche size is significantly smaller in the 99.5% aerogel. The reduction in the transition temperature and avalanche size may be the consequence of weaker disorder for the crystallization in the very high porosity aerogel.

Keywords

4He Crystal growth Aerogel Avalanche 

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Ryota Masumoto
    • 1
  • Ken-ichi Ueno
    • 1
  • Hirofumi Matsuda
    • 1
  • Ryuji Nomura
    • 1
  • Yuichi Okuda
    • 1
  1. 1.Department of Condensed Matter PhysicsTokyo Institute of TechnologyTokyoJapan

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