
We consider isotropic XY model in the transverse magnetic field on the one dimensional lattice. Another name of the model in Heisenberg XXO model of spin 1/2.We solved long standing problem of evaluation of temperature correlations. We first represent correlation function in the model, by means of completely integrable differential equation. This is famous Ablowitz-Ladik lattice Nonlinear Schrodinger equation.Correlation function is the $��$ function of this differential equation. We solved this equation and evaluate asymptotics.
6 pages, TEX ITP-SB-92-47, INS #211 ENSLAPP 394
High Energy Physics - Theory, Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), High Energy Physics - Theory (hep-th), Condensed Matter (cond-mat), FOS: Physical sciences, Condensed Matter, Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
High Energy Physics - Theory, Quantum Physics, Statistical Mechanics (cond-mat.stat-mech), High Energy Physics - Theory (hep-th), Condensed Matter (cond-mat), FOS: Physical sciences, Condensed Matter, Quantum Physics (quant-ph), Condensed Matter - Statistical Mechanics
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