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- W2022134986 abstract "Theoretical predictions of a semiclassical method---the pure-quantum self-consistent harmonic approximation---for the correlation length and staggered susceptibility of the two-dimensional quantum Heisenberg antiferromagnet (2DQHAF) on the square lattice agree very well with recent quantum Monte Carlo data for $S=1,$ as well as with experimental data for the $S=5/2$ compounds ${mathrm{Rb}}_{2}{mathrm{MnF}}_{4}$ and ${mathrm{KFeF}}_{4}.$ The theory is parameter free and can be used to estimate the exchange coupling: for ${mathrm{KFeF}}_{4}$ we find $J=2.33ifmmodepmelsetextpmfi{}0.33$ meV, consistent with previously determined values. On this basis, the adequacy of the quantum nonlinear $ensuremath{sigma}$ model approach in describing the 2DQHAF when $S>~1$ is discussed." @default.
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- W2022134986 date "1998-12-01" @default.
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- W2022134986 title "Heisenberg antiferromagnet on the square lattice for<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>S</mml:mi><mml:mo>>~</mml:mo><mml:mn>1</mml:mn></mml:math>" @default.
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- W2022134986 doi "https://doi.org/10.1103/physrevb.58.14151" @default.
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