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1991•Europhysics Letters (EPL)Requires access

Superrandiance and Superfluidity in 4 He

Elisabetta Giudice, Matteo Giuffrida, R. Mele, G. Preparata

Open publisher page 5 citations

Abstract

We study the effect of the superfluidity of 4He of a superradiant interaction among the 4He-atoms. We show that: i) a microscopic two-fluid picture emerges; ii) the T-dependence of the roton energy Δ(T) is correctly described; iii) the p = 0 fraction of the Bose condensate is ρc 0.15; iv) the observed values of the critical velocity vcrit can be adequately understood.

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What this paper is about

We study the effect of the superfluidity of 4He of a superradiant interaction among the 4He-atoms. We show that: i) a microscopic two-fluid picture emerges; ii) the T-dependence of the roton energy Δ(T) is correctly described; iii) the p = 0 fraction of the Bose condensate is ρc 0.15; iv) the observed values of the critical velocity vcrit can be adequately understood.

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Available abstract

We study the effect of the superfluidity of 4He of a superradiant interaction among the 4He-atoms. We show that: i) a microscopic two-fluid picture emerges; ii) the T-dependence of the roton energy Δ(T) is correctly described; iii) the p = 0 fraction of the Bose condensate is ρc 0.15; iv) the observed values of the critical velocity vcrit can be adequately understood.

Key concepts: Superfluidity, Roton, Physics, Helium-4, Critical ionization velocity, Isotopes of helium, Fraction (chemistry), Helium-3

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