caa a22 4500 445365951 CHVBK 20180317142930.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10909-010-0332-y doi (NATIONALLICENCE)springer-10.1007/s10909-010-0332-y Frequency and Size Dependences of Superfluidity inLow-Dimensional 4He Fluids [Elektronische Daten] [N. Wada, Y. Minato, T. Matsushita, M. Hieda] We have studied superfluidity of 4He fluids in two- and one-dimensional states. In the 2D state of the 4He films on flat substrate, superfluidity was observed in the normal fluid state above the 2D Kosterlitz-Thouless temperature at high measurement frequencies. The superfluidity in 2D also depends on the system size, e.g. pore diameter of porous glasses and grain size of powder. The 1D state was realized for 4He fluid nanotubes formed in 1D nanopores 1.8-4.7nm in diameter and about 300nm in length. Superfluidity in the 1D state was observed by the torsional oscillator experiment. The results are qualitatively well reproduced by the Monte Carlo calculation for a classical XY spin system modeled on the present 4He nanotubes. Although the 1D state is in the normal fluid state at any finite low temperatures due to the 1D phonon fluctuation, the superfluid frequency shift Δf of the oscillator can be observed. Above a temperature, Δf decreases due to another kind of 1D thermal fluctuation of which excitations destroy the phase coherence in the nanotubes. The excitations depend on the tube length as well as the tube diameter. Springer Science+Business Media, LLC, 2010 Superfluidity nationallicence Low-dimensional state nationallicence 4He fluid nanotubes nationallicence Wada N. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut Minato Y. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut Matsushita T. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut Hieda M. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 549-558 0022-2291 162:5-6<549 2011 162 10909 https://doi.org/10.1007/s10909-010-0332-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10909-010-0332-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wada N. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Minato Y. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Matsushita T. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut NATIONALLICENCE 700 1- Hieda M. Department of Physics, Graduate School of Science, Nagoya University, Furou-chou, Chikusa-ku, 464-8602, Nagoya, Japan aut NATIONALLICENCE 773 0- Journal of Low Temperature Physics Springer US; http://www.springer-ny.com 162/5-6(2011-03-01), 549-558 0022-2291 162:5-6<549 2011 162 10909 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer