Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2009-11-09
Eur. Phys. J. B 67, 169 (2009)
Physics
Condensed Matter
Other Condensed Matter
13 pages, 15 figures
Scientific paper
We study in random-phase approximation the newly discovered supersolid phase of ${}^4$He and present in detail its finite temperature properties. ${}^4$He is described within a hard-core quantum lattice gas model, with nearest and next-nearest neighbour interactions taken into account. We rigorously calculate all pair correlation functions in a cumulant decoupling scheme. Our results support the importance of the vacancies in the supersolid phase. We show that in a supersolid the net vacancy density remains constant as function of temperature, contrary to the thermal activation theory. We also analyzed in detail the thermodynamic properties of a supersolid, calculated the jump in the specific heat which compares well to the recent experiments.
Gulacsi Miklos
Stoffel Andre Johannes
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