Electromagnons in the spin collinear state of a triangular lattice antiferromagnet

Details Electromagnons in the spin collinear state of a triangular lattice antiferromagnet Electromagnons in the spin collinear state of a triangular lattice antiferromagnet

2010-08-27

arxiv.org/abs/1008.4709v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures. Accepted in Physical Review Letters

Scientific paper

Terahertz time-domain spectroscopy was performed to directly probe the low-energy (1-5 meV) electrodynamics of triangular lattice antiferromagnets CuFe1-xGaxO2 (x = 0.00, 0.01, and 0.035). We discovered an electromagnon (electric-field-active magnon) excitation at 2.3 meV in the paraelectric up-up-down-down collinear magnetic phase, while this electromagnon vanishes in the ferroelectric helimagnetic phase. Anti-correlation with noncollinear magnetism excludes the exchange-striction mechanism as the origin of dynamical magnetoelectric coupling, and hence evidences the observation of spin-orbit coupling mediated electromagnon in the present compound.

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