DOI: https://doi.org/10.30970/jps.06.298
HELIUM-4 ENERGY AND SPECIFIC HEAT IN SUPERFLUID AND NORMAL PHASE
A. A. Rovenchak
Ivan Franko National University of Lviv, Department for Theoretical Physics,
12 Drahomanov Str., Lviv, UA–79005, Ukraine
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Journal of Physical Studies 6(3), 298–304 (2002)
DOI: https://doi.org/10.30970/jps.06.298 HELIUM-4 ENERGY AND SPECIFIC HEAT IN SUPERFLUID AND NORMAL PHASEA. A. Rovenchak
Ivan Franko National University of Lviv, Department for Theoretical Physics, |
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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 $0 < T/T_c < 0.65$ and $T/T_c> 1.32$ where $T_c$ stands for the phase transition point.
PACS number(s): 05.70.Ce, 67.20.+k, 67.40.$-$w