Critical parameters and universal amplitude ratios of two-dimensional spin-S Ising models using high- and low-temperature expansions

Physics – High Energy Physics – High Energy Physics - Lattice

Scientific paper

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15 pages, latex, no figures, corrected two typos

Scientific paper

10.1103/PhysRevB.67.054402

For the study of Ising models of general spin S on the square lattice, we have combined our recently extended high-temperature expansions with the low-temperature expansions derived some time ago by Enting, Guttmann and Jensen. We have computed for the first time various critical parameters and improved the estimates of others. Moreover the properties of hyperscaling and of universality (spin S independence) of exponents and of various dimensionless amplitude combinations have been verified accurately. Assuming the validity of the lattice-lattice scaling, from our estimates of critical amplitudes for the square lattice we have also obtained estimates of the corresponding amplitudes for the spin S Ising model on the triangular, honeycomb, and kagome` lattices.

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