NDLI: Dynamical Transition of $^{4}$He Crystallization in a Very High Porosity Aerogel

Content Provider	Springer Nature Link
Author	Masumoto, Ryota Ue, Ken ichi Matsuda, Hirofumi mura, Ryuji Okuda, Yuichi
Copyright Year	2010
Abstract	Crystallization of $^{4}$He 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.
Starting Page	399
Ending Page	406
Page Count	8
File Format	PDF
ISSN	00222291
Journal	Journal of Low Temperature Physics
Volume Number	162
Issue Number	5-6
e-ISSN	15737357
Language	English
Publisher	Springer US
Publisher Date	2010-10-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	$^{4}$He Crystal growth Aerogel Avalanche Magnetism, Magnetic Materials Characterization and Evaluation of Materials Condensed Matter Physics
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Materials Science

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