Spin-Nematic Interaction in the Multiferroic Compound Ba2CoGe2O7

We demonstrate the existence of the spin-nematic interactions in an easy-plane type antiferromagnet Ba2CoGe2O7 by exploring the magnetic anisotropy and spin dynamics. The combination of neutron scattering and magnetic susceptibility measurements reveals that the origin of the in-plane anisotropy is an antiferro-type interaction of the spin-nematic operator. The relation between the nematic operator and the electric polarization in the ligand symmetry of this compound is presented. The introduction of the spin-nematic interaction is useful to understand the physics of spin and electric dipole in multiferroic compounds.


Published in:
Physical Review Letters, 112, 12
Year:
2014
Publisher:
College Pk, American Physical Society
ISSN:
0031-9007
Laboratories:




 Record created 2014-05-19, last modified 2018-03-17


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