摘要: The superfluid properties of 4 He absorbed in porous media are discussed. Emphasis is given to the nature of the superfluid transition for helium contained in a variety of different porous structures. Recent heat capacity and superfluid measurements for helium in Vycor glass and other porous media are presented in some detail. The onset of superfluidity as a function of adsorbed helium coverage at zero temperature, or “boson localization,” is touched on briefly. The problem of dissipation of superflow in porous media, especially in …
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