Magnetic anisotropy of BaCu2Si2O7: theory and antiferromagnetic resonance

Abstract

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.

4 pages, 3 figures

References in corpus (3)

• Two-stage spin-flop transitions in S = 1/2 antiferromagnetic spin chain BaCu_2Si_2O_7
• Magnetic order and spin-waves in the quasi-1D S=1/2 antiferromagnet $\mathbf{BaC}{\mathbf{u}}_2\mathbf{S}{\mathbf{i}}_2{\mathbf{O}}_7$
• Structure of the exotic spin-flop states in BaCu2Si2O7

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• Magnetic Properties of the low dimensional BaM${}_2$Si${}_2$O${}_7$(M= Cu, Co, Mn) system
• Field-induced electric polarization and elastic softening caused by parity-mixed $d$-$p$ hybridized states with electric multipoles in Ba${}_2$CuGe${}_2$O${}_7$
• Phase diagram of low-dimensional antiferromagnets with competing order parameters: A Ginzburg-Landau-theory approach