Electromagnons in the multiferroic state of perovskite manganites with symmetric-exchange striction

Abstract

We have investigated electrically-active magnetic excitations (electromagnons) in perovskite manganites with the $E$-type (up-up-down-down) spin structure by terahertz spectroscopy. Eu${}_{1-x}$Y${}_x$MnO${}_3$ (0.1$\le x\le$1) and Y${}_{1-y}$Lu${}_y$MnO${}_3$ (0$\le y\le$1) without magnetic $f$-moments, which host collinear sinusoidal, $A$-type, cycloidal, and $E$-type spin orders, are used to examine the systematics of possible electromagnons. Three-peak structures (23, 35, 45 cm${}^{-1}$) of magnetic origin show up in the $E$-type phase with little composition ($y$) dependence of frequencies, making a contrast with the electromagnons observed in the cycloidal-spin ($x\le 0.8$) phases. One of these electromagnon is ascribed to the zone-edge magnon mode based on the calculated magnon dispersions.

5 pages, 4 figures

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Cited by in corpus (6)

• Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
• Theory of spin-phonon coupling in multiferroic Mn perovskites
• Magnetically-Driven Ferroelectric Atomic Displacements in perovskite like YMnO3
• Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8
• Optical identification of hybrid magnetic and electric excitations in Dy3Fe5O12 garnet
• Magnetic order and electromagnon excitations in DyMnO3 studied by neutron scattering experiments