Cluster expansion for the description of condensed state: crystalline cell approach

被引:2
作者
Bokun, G. S. [1 ]
Holovko, M. F. [2 ]
机构
[1] Belarusian State Technol Univ, 13a Sverdlov St, Minsk 220006, BELARUS
[2] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, 1 Svientsitskii St, UA-79011 Lvov, Ukraine
基金
欧盟地平线“2020”;
关键词
lattice models; cluster expansions; single-particle cell potential; free energy; FLUID;
D O I
10.5488/CMP.21.43501
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A well-known cluster expansion, which leads to virial expansion for the free energy of low density systems, is modified in such a way that it becomes applicable to the description of condensed state of matter. To this end, the averaging of individual clusters over the states of an ideal gas is replaced by the averaging over the states of a non-correlated crystal using single-particle cell potentials. As a result, we arrive at the expansion of the partition function in correlations on the basis of single-particle functions corresponding to the multiplicative approximation. The cell potentials defining these functions are found from the condition of the minimum of the remainder in the constructed decomposition.
引用
收藏
页码:43501 / 43516
页数:16
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