QCM Measurements of Superfluid Response in 4He Films up to 180 MHz |
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Authors: | Tsuyoshi Kato Mitsunori Hieda Taku Matsushita Nobuo Wada |
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Affiliation: | (1) Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan |
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Abstract: | At finite frequencies, a dynamic Kosterlitz–Thouless (KT) theory predicts a frequency dependence of the superfluid transition
in 4He films on planar surfaces. We report results of QCM measurements to study the superfluid response on planar gold surfaces
for very high frequencies up to 180 MHz in the temperature range of 0.6–1.0 K. As the frequency is increased, we observed
the expected KT behavior that the superfluid transition shifts to a higher temperature from the static transition temperature
T
KT and the transition temperature region broadens. The frequency dependence of the dissipation peak temperature at the transition
agrees with a simple equation of the frequency dependence based on the dynamic KT theory. The microscopic parameter for the
dynamic transition, the ratio of the diffusion constant to the square of the vortex core radius D/r
0
2, is estimated to be on the order of 1010 s−1. |
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Keywords: | 67 57 Np 67 70 +n |
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