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

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

2007-07-24

arxiv.org/abs/0707.3614v1

Phys. Rev. B 77, 014438 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 9 figures included

Scientific paper

10.1103/PhysRevB.77.014438

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 \nu ~ 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.

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