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Low temperature behavior of two-dimensional quantum antiferromagnets

Dec, 1987
4 pages
Published in:
  • Phys.Rev.Lett. 60 (1988) 1057-1060
DOI:
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Abstract: (APS)
Recent neutron-scattering data for the spin-correlation length in La2CuO4 can be fitted quantitatively with an analysis of the quantum mechanical nonlinear σ model in two space dimensions. The coupling constant must be chosen in the range where an isolated CuO2 layer has antiferromagnetic order at T=0. The parameters are consistent with the spin-wave theory for the nearest-neighbor spin-(1/2 Heisenberg antiferromagnet on a square lattice.