Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-10-20
Phys. Rev. B 82, 100403 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 1 figure
Scientific paper
A new approach for calculations of Dzyaloshinskii-Moriya interactions in molecules and crystals is proposed. It is based on the exact perturbation expansion of total energy of weak ferromagnets in the canting angle with the only assumption of local Hubbard-type interactions. This scheme leads to a simple and transparent analytical expression for Dzyaloshinskii-Moriya vector with a natural separation into spin and orbital contributions. The main problem was transferred to calculations of effective tight-binding parameters in the properly chosen basis including spin-orbit coupling. Test calculations for La$_2$CuO$_4$ give the value of canting angle in a good agreement with experimental data.
Katsnelson Mikhail I.
Kvashnin Y. O.
Lichtenstein Alexander I.
Mazurenko V. V.
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