Spin excitations in La2CuO4: Consistent description by inclusion of ring exchange

A. A. Katanin, A. P. Kampf

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67 Citations (Scopus)


We consider the square lattice Heisenberg antiferromagnet with plaquette ring exchange and a finite interlayer coupling leading to a consistent description of the spin-wave excitation spectrum in La2CuO4. The values of the in-plane exchange parameters, including ring exchange J, are obtained consistently by an accurate fit to the experimentally observed in-plane spin-wave dispersion, while the out-of-plane exchange interaction is found from the temperature dependence of the sublattice magnetization at low temperatures. The fitted exchange interactions J = 151.9 meV and J = 0.24J give values for the spin stiffness and the Néel temperature in excellent agreement with the experimental data.

Original languageEnglish
Article number100403
Pages (from-to)1004031-1004034
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
Publication statusPublished - 1 Sep 2002
Externally publishedYes


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