Finite Temperature Properties of a Supersolid: a RPA Approach

Autor:	Stoffel, A. J., Gulacsi, M.
Rok vydání:	2009
Předmět:	Condensed Matter - Other Condensed Matter Condensed Matter - Statistical Mechanics
Zdroj:	Eur. Phys. J. B 67, 169 (2009)
Druh dokumentu:	Working Paper
DOI:	10.1140/epjb/e2009-00018-6
Popis:	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. Comment: 13 pages, 15 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0911.1698 Zobrazit plný text záznamu View this record from Arxiv