Low Temperature Physics: 39, 780 (2013); https://doi.org/10.1063/1.4821077
Физика Низких Температур: Том 39, Выпуск 9 (Сентябрь 2013), c. 1006-1011    ( к оглавлению , назад )

Formation of superfluid liquid pocket in aerogel and its solidification by cooling

H. Matsuda, A. Ochi, R. Isozaki, R. Nomura, and Y. Okuda

Department of Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan
E-mail: nomura.r.aa@m.titech.ac.jp

Received February 25, 2013

Аннотация

Formation of superfluid liquid pockets of 4He surrounded by 4He crystals were observed in an aerogel of 96% porosity. The liquid pockets did not crystallize by application of pressure but crystallized via avalanche by cooling below a particular temperature. The crystallization by cooling was also observed when crystals occupied a smaller portion of the aerogel. Driving force for the crystallization by cooling and possible mass transport process are discussed.

PACS: 64.70.D– Solid-liquid transitions;
PACS: 67.80.bf Liquid-solid interfaces; growth kinetics;
PACS: 67.25.D– Superfluid phase.

Ключевые слова: superfluid 4He, crystal growth, aerogel, supersolid.