Helium-4 Energy and Specific Heat in Superfluid and Normal Phase
Abstract
The calculation of the He4 energy and specific heat is carried out in a wide temperature range within the two-time temperature Green functions approach. The approximation improving the random phase approximation is developed providing the correct behaviour of the calculated specific heat at the temperatures 0 < T/Tc < 0.65 and T/Tc> 1.32 where Tc stands for the phase transition point.
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