Journal of Low Temperature Physics

, Volume 78, Issue 1–2, pp 79–129 | Cite as

Rough model of a quantum liquid

  • A. M. Dyugaev


As applied to condensed helium and hydrogen, a theory of quantum effects is suggested, one that is insensitive to the type of statistics of particles—the theory of quantum nondegenerate liquids. Evidently such a theory assumes that the mass of the atom and its polarization are small. For a zero-approximation, a system of hard spheres is chosen, and the attractive forces and the softness of the atom are considered to be small effects. The correlations between thermodynamic and kinetic characteristics of liquid He3 and He4 are obtained. On the basis of the experimental data for He4, and an isotropic law of the corresponding states for quantum systems with a large value of the de Boer parameter, all thermodynamic functions of liquid He3 are defined and tabulated in the regions of temperatures and molar volumes where they have not yet been measured. A rough model of a quantum liquid is suggested, based on the assumption of a dominating contribution by the diffusion excitations to the free energy of a dense condensed medium. The equation of state of the quantum liquid is derived. On the basis of the experimental data for He4, the equation of state of a quantum liquid consisting of hard spheres is compared with the similar equations obtained by a numeric computer simulation. The energy of the ground state of spin-oriented condensed hydrogen isotopes is defined.


Free Energy Helium Computer Simulation Magnetic Material Molar Volume 
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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • A. M. Dyugaev
    • 1
  1. 1.L. D. Landau Institute for Theoretical PhysicsUSSR Academy of SciencesMoscowUSSR

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