Abstract
We report a neutron scattering study of the spin correlations in the model 2D, [ital S]=1/2, square-lattice Heisenberg antiferromagnetic Sr[sub 2]CuO[sub 2]Cl[sub 2]. The spin correlation lengths obtained agree quantitatively with values deduced from Monte Carlo simulations over a wide range of temperature. The combined data, which cover the length scale from 1 to 200 lattice constants, are predicted accurately with no adjustable parameters by renormalized classical theory for the quantum nonlinear sigma model.
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