Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
1992-09-04
Phys.Rev. B47 (1993) 11969-11979
Physics
High Energy Physics
High Energy Physics - Lattice
12 pages, plain revtex, sorry no figures, Preprint IFUM 429/FT
Scientific paper
10.1103/PhysRevB.47.11969
High temperature series expansions of the spin-spin correlation function for the plane rotator (or XY) model on the square lattice are extended by three terms through order $\beta^{20}$. Tables of the expansion coefficients are reported for the correlation function spherical moments of order $l=0,1,2$. The expansion coefficients through $\beta^{15}$ for the vorticity are also tabulated. Our analysis of the series supports the Kosterlitz-Thouless predictions on the structure of the critical singularities and leads to fairly accurate estimates of the critical parameters.
Butera Paolo
Comi Marco
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