Faraday instability of superfluid surface.
We observed that Faraday waves are parametrically generated on a free surface of superfluid 4He when a sample cell is vibrated vertically. Standing-wave patterns appear on the surface, and their frequencies are one-half the driving frequency. We observed clear threshold amplitudes of the vibration for the instability. The difference in the threshold between the superfluid and the normal fluid is explained by a wall damping.
Abe
Haruka
H
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro, Tokyo 152-8551, Japan.
Ueda
Tetsuto
T
Morikawa
Michihiro
M
Saitoh
Yu
Y
Nomura
Ryuji
R
Okuda
Yuichi
Y