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Derivation of the generalized non-linear sigma model in the presence of the Dzyaloshinskii–Moriya interaction

✍ Scribed by L. Benfatto; M. Silva Neto; V. Juricic; C. Morais Smith

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
105 KB
Volume
378-380
Category
Article
ISSN
0921-4526

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✦ Synopsis

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 La 2 CuO 4 compounds.

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