22nd order high-temperature expansion of nearest-neighbor models with O(2) symmetry on a simple cubic lattice

Details 22nd order high-temperature expansion of nearest-neighbor models with O(2) symmetry on a simple cubic lattice 22nd order high-temperature expansion of nearest-neighbor models with O(2) symmetry on a simple cubic lattice

2007-01-04

arxiv.org/abs/cond-mat/0701069v2

Physics

Condensed Matter

Statistical Mechanics

4 pages

Scientific paper

We present the high-temperature series for a nearest-neighbor model with O(2) symmetry on a simple cubic lattice with the most general single-site potential. In particular, the magnetic susceptibility and the second-moment correlation length are computed to 22nd order. The series specialized to some particular improved Hamiltonians have been already analyzed in the paper M. Campostrini, M. Hasenbusch, A. Pelissetto, and E. Vicari, Phys. Rev. B 74, 144506 (2006) [cond-mat/0605083], to determine the critical exponents and other universal quantities of the three-dimensional XY universality class.

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