caa a22 4500 445366079 CHVBK 20180317142930.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0245-9 doi (NATIONALLICENCE)springer-10.1007/s10909-010-0245-9 Dynamical Transition of 4He Crystallization in a Very High Porosity Aerogel [Elektronische Daten] [Ryota Masumoto, Ken-ichi Ueno, Hirofumi Matsuda, Ryuji Nomura, Yuichi Okuda] 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. Springer Science+Business Media, LLC, 2010 4He nationallicence Crystal growth nationallicence Aerogel nationallicence Avalanche nationallicence Masumoto Ryota Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut Ueno Ken-ichi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut Matsuda Hirofumi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut Nomura Ryuji Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut Okuda Yuichi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 399-406 0022-2291 162:5-6<399 2011 162 10909 https://doi.org/10.1007/s10909-010-0245-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0245-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Masumoto Ryota Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut NATIONALLICENCE 700 1- Ueno Ken-ichi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut NATIONALLICENCE 700 1- Matsuda Hirofumi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut NATIONALLICENCE 700 1- Nomura Ryuji Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut NATIONALLICENCE 700 1- Okuda Yuichi Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, 152-8551, Tokyo, Meguro-ku, Japan aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 399-406 0022-2291 162:5-6<399 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer