Abstract
We study in random-phase approximation the newly discovered supersolid phase of 4He and present in detail its finite temperature properties. 4He 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.
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Stoffel, A., Gulácsi, M. Finite temperature properties of a supersolid: a RPA approach. Eur. Phys. J. B 67, 169–181 (2009). https://doi.org/10.1140/epjb/e2009-00018-6
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DOI: https://doi.org/10.1140/epjb/e2009-00018-6