Abstract
We have studied the frequency dependence of the superfluid onset for4He films on Mylar substrates using a two-torsional-oscillators technique. A peak of the dissipation accompanied by the superfluid onset appears at higher temperatures for 2009 Hz than for 530 Hz. The temperature difference ΔTp between the two peaks is 2.0 ± 0.5 mKfor coverages with the onset temperature Tc of 1.4 K, and increases by a factor of three with decreasing Tc from 1.4 to 0.95 K. In the temperature dependence of the dissipation, the dissipation width also increases by a factor of three with decreasing Tc from 1.4 to 0.95 K. The Tc dependencies of ΔTp and the dissipation width indicate that an intrinsic parameter D/r0 2 of a vortex decreases with the superfluid onset temperature, where D is a diffusion constant and r0 a core radius.
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References
J.M. Kosterlitz and D.J. Thouless,J. Phys. C 6, 1181 (1973).
V. Ambegaokar, B.I. Halperin, D.R. Nelson and E. Siggia,Phys. Rev, B 21, 1806 (1980).
D.J. Bishop and J.D. Reppy,Phys. Rev. B 22, 5171 (1980).
P.W. Adams and W.I. Glaberson,Phys. Rev. B 35, 4633 (1987).
G. Agnolet, D.F. McQueeney and J.D. Reppy,Phys. Rev. B 39, 8934 (1989).
K. Shirahama, M. Kubota, S. Ogawa, N. Wada and T. Watanabe,Phys. Rev. Lett. 64, 1541 (1990).
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Yano, H., Jocha, T. & Wada, N. Frequency dependence of superfluid onset temperature of4He films on oscillating substrates. J Low Temp Phys 101, 513–518 (1995). https://doi.org/10.1007/BF00753346
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DOI: https://doi.org/10.1007/BF00753346