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- W2055267595 abstract "We use the diagram technique for spin operators to calculate Green's functions and observables of the spin-$frac{1}{2}$ quantum Heisenberg antiferromagnet on a square lattice. The first corrections to the self-energy and interaction are taken into account in the chain diagrams. The approximation reproduces main results of Takahashi's modified spin-wave theory [Phys. Rev. B 40, 2494 (1989)] and is applicable in a wider temperature range. The energy per spin calculated in this approximation is in good agreement with the Monte Carlo and small-cluster exact-diagonalization calculations in the range $0<~Tensuremath{lesssim}1.2J$ where J is the exchange constant. For the static uniform susceptibility the agreement is good for $Tensuremath{lesssim}0.6J$ and becomes somewhat worse for higher temperatures. Nevertheless the approximation is able to reproduce the maximum in the temperature dependence of the susceptibility near $T=0.9J.$" @default.
- W2055267595 created "2016-06-24" @default.
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- W2055267595 date "2001-05-14" @default.
- W2055267595 modified "2023-09-27" @default.
- W2055267595 title "One-loop approximation for the Heisenberg antiferromagnet" @default.
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- W2055267595 doi "https://doi.org/10.1103/physrevb.63.214421" @default.
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