Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 80, Issue 7, Pages -Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.80.073708
Keywords
multiferroics; magnetic resonance; nonreciprocal directional dichroism; Ba2CoGe2O7
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
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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.
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