Magnetic anisotropy of BaCu2Si2O7: theory and antiferromagnetic resonance

Details Magnetic anisotropy of BaCu2Si2O7: theory and antiferromagnetic resonance Magnetic anisotropy of BaCu2Si2O7: theory and antiferromagnetic resonance

2002-06-10

arxiv.org/abs/cond-mat/0206151v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.66.184414

Antiferromagnetic resonance (AFMR) of BaCu2Si2O7 and a microscopic theory of the magnetic anisotropy of spin 1/2 chain compounds with folded CuO3 geometry being in good agreement with the available data are presented. The AFMR studies at 4.2 K show the existence of two gaps (40 and 76 GHz) at zero magnetic field and of two spin re-orientation transitions for H||c. The microscopic origin of the two gaps is shown to be Hund's rule coupling which leads to a "residual anisotropy" beyond the compensation of the Dzyaloshinskii-Moriya term by the symmetric anisotropy which would be valid without Hund's coupling.

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