Derivation of the generalized Non Linear Sigma Model in the presence of the Dzyaloshinskii-Moriya interaction

Details Derivation of the generalized Non Linear Sigma Model in the presence of the Dzyaloshinskii-Moriya interaction Derivation of the generalized Non Linear Sigma Model in the presence of the Dzyaloshinskii-Moriya interaction

2005-12-21

arxiv.org/abs/cond-mat/0512528v1

Physica B378:449-450,2006

Physics

Condensed Matter

Strongly Correlated Electrons

Proceedings of SCES05, to appear on Physica B

Scientific paper

10.1016/j.physb.2006.01.194

We derive the long-wavelength non-linear sigma model for a two-dimensional Heisenberg system in the presence of the Dzyaloshinskii-Moriya and pseudodipolar interactions. We show that the system is a non-conventional easy-axis antiferromagnet, displaying an anomalous coupling between the magnetic field and the staggered order parameter. Our results are in good agreement with recent experimental data for undoped La2CuO4 compounds.

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