Abstract
We have developed optical, interferometric methods for investigations of interfaces at ultra low temperatures. In our scheme conventional optical windows are avoided: laser illumination (He-Ne) is guided into the cryostat via a single-mode optical fiber and images are taken using a CCD sensor mounted inside the 4-K vacuum can. A real-time video camera has been successfully used in investigations of superfluid3He down to 0.6 mK whereas a slow-scan camera has been employed for optimal contrast in low-intensity imaging of liquid/solid interfaces (reflection coefficient ∼10−6). The investigated topics include (1) superfluid3He surface in rotation and during rapid deceleration, (2) hydrodynamics of thin superfluid3He layers, (3) superfluid/solid interface in4He, and (4) wetting of superfluid4He by normal3He in phase separated mixtures. A vertical resolution of 10 nm and even below has been achieved in these studies.
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References
K.O. Keshishev, A.Ya. Parshin, and A.I. Shalnikov,Soviet Scientific Reviews, Section A: Physics Reviews, vol. 4, edited by I.M. Khalatnikov, New York (1982), p. 155.
D.V. Osborne,Proc. Phys. Soc. A 63, 909 (1950); E.L. Andronikashvili and Yu.G. Mamaladze,Rev. Mod. Phys. 38, 567 (1966).
K.-P. Müller, and P. Haarer,Phys. Rev. Lett. 66, 2344 (1991); E. Rolley, C. Guthmann, E. Chevalier, and S. Balibar,J. Low Temp. Phys. 99, 851 (1995).
A.J. Manninen, J.P. Pekola, G.M. Kira, J.P. Ruutu, A.V. Babkin, H. Alles, and O.V. Lounasmaa,Phys. Rev. Lett. 69, 2392 (1992).
R. Wagner, P.J. Ras, P. Remeijer, S.C. Steel, and G. Frossati,J. Low Temp. Phys. 95, 715 (1994).
H. Alles, J.P. Ruutu, A.V. Babkin, P.J. Hakonen, A.J. Manninen, and J.P. Pekola,Rev. Sci. Instrum. 65, 1784 (1994).
See, e.g., J. Pipman, S.G. Lipson, J. Landau, and N. Bochner,J. Low Temp. Phys. 31, 119 (1978); J. Bodensohn, K. Nicolai, and P. Leiderer,Z. Phys. B — Cond. Matter 64, 55 (1986); F. Gallet, S. Balibar, and E. Rolley,J. Physique 48, 369 (1987).
P.L. Marston and W.M. Fairbank,Phys. Rev. Lett. 39, 1208 (1977); P.L. Marston, Ph.D. thesis, Stanford University, 1976.
A.V. Babkin, H. Alles, P.J. Hakonen, J.P. Ruutu, J.P. Saramäki, and A. Ya. Parshin, submitted for publication.
E.R. Grilly,J. Low Temp. Phys. 4, 615 (1971);11, 33 (1973).
A. J. Manninen, H. Alles, A.V. Babkin, and J.P. Pekola,Physica B 178, 352 (1992).
See,e.g., F. Pobell,Matter and Methods at Low Temperatures (Springer, Berlin, 1992), p. 39.
H. Alles, J.P. Ruutu, A.V. Babkin, P.J. Hakonen, O.V. Lounasmaa, and E.B. Sonin,Phys. Rev. Lett. 74, 2744 (1995).
J.P. Ruutu, H. Alles, A.V. Babkin, P.J. Hakonen, and E.B. Sonin,Europhys. Lett. 28, 163 (1994).
H. Alles, J.P. Ruutu, A.V. Babkin, and P.J. Hakonen,Phys. Rev. Lett. 73, 1388 (1994).
P.J. Hakonen, J.S. Penttilä, and E.B. Sonin,J. Low Temp. Phys. 96, 355 (1994).
A.F. Andreev,Pis'ma Zh. Eksp. Teor. Fiz. 58, 740 (1993) [JETP Lett. 58, 715 (1993)].