Theory of Magnetoelectric Resonance in Two-Dimensional S = 3/2 Antiferromagnet Ba2CoGe2O7 via Spin-Dependent Metal-Ligand Hybridization Mechanism

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概要

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• We investigate magnetic excitations in Ba2CoGe2O7. In terahertz absorption experiments of the compound, novel magnetic excitations, i.e., conventional magnetic resonance at 2 meV as well as both electric- and magnetic-active excitation at 4 meV, have been observed. These magnetic excitations can be explained naturally in an S=3/2 Heisenberg model on a square lattice with uniaxial anisotropy and Dzyaloshinsky--Moriya terms. We also indicate that, via the spin-dependent metal-ligand hybridization mechanism, the 4 meV excitation is electric-active because of the coupling between the spin and electric dipole. Moreover, at the 4 meV excitation, an interference between magnetic and electric responses emerges as a cross-correlated effect. Such cross-correlation effects explain the nonreciprocal linear directional dichroism observed in Ba2CoGe2O7.

• 2011-07-15

著者

• MIYAHARA Shin

  Multiferroics Project (MF), ERATO, Japan Science and Technology Agency (JST)

• Furukawa Nobuo

  Multiferroics Project (MF), ERATO, Japan Science and Technology Agency (JST), c/o Department of Applied Physics, The University of Tokyo, Bunkyo, Tokyo 113-8656, Japan

関連論文

• Projection Method for Exact Diagonalization in the Strong Coupling Limit for Frustrated Models with Highly Degenerate Ground States
• Theory of Magnetoelectric Resonance in Two-Dimensional S = 3/2 Antiferromagnet Ba2CoGe2O7 via Spin-Dependent Metal-Ligand Hybridization Mechanism

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