Terahertz spectroscopy of electromagnons in Eu_{1-x}Y_xMnO_3

Abstract

Dielectric permittivity spectra of yttrium-doped EuMnO${}_3$ in the composition range 0 =< x =< 0.5 have been investigated in the terahertz frequency range. Magnetoelectric contributions to the permittivity were observed in all compositions for ac electric fields parallel to the crystallographic a-axis. Well defined electromagnons exist for x >= 0.2 close to ν~ 20 cm^{-1} and with dielectric strength strongly increasing on doping. In addition to electromagnons, a broad contribution of magnetoelectric origin is observed for all compositions. For Eu_{0.8}Y_{0.2}MnO_3 the electromagnons can be suppressed by external magnetic fields which induce a canted antiferromagnetic phase. Magnetoelectric effects in the different doping regimes are discussed in detail.

7 pages, 9 figures included

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• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Terahertz time-domain spectroscopy of electromagnons in multiferroic perovskite manganites
• Magnetic and magnetoelectric excitations in TbMnO${}_3$
• Theoretically predicted picosecond optical switching of spin chirality in multiferroics
• Electric-dipole active two-magnon excitation in {\textit{ab}} spiral spin phase of a ferroelectric magnet Gd${}_{\text{0.7}}$Tb${}_{\text{0.3}}$MnO${}_{\text{3}}$
• Evidence for magnon-phonon coupling in the topological magnet Cu${}_3$TeO${}_6$
• Spin-dependent polaron formation dynamics in Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$ probed by femtosecond pump-probe spectroscopy
• Dynamical magnetoelectric effects induced by the Dzyaloshinskii-Moriya interaction in multiferroics
• Terahertz frequency magnetoelectric effect in Ni doped CaBaCo${}_4$O${}_7$
• Dielectric relaxation by quantum critical magnons