Terahertz spectroscopy of electromagnons in Eu {1-x}Y xMnO 3 - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: Dielectric permittivity spectra of yttrium-doped EuMnO$ 3$ in the compositionrange 0 =< x =< 0.5 have been investigated in the terahertz frequency range.Magnetoelectric contributions to the permittivity were observed in allcompositions for ac electric fields parallel to the crystallographic a-axis.Well defined electromagnons exist for x >= 0.2 close to u ~ 20 cm^{-1} andwith dielectric strength strongly increasing on doping. In addition toelectromagnons, a broad contribution of magnetoelectric origin is observed forall compositions. For Eu {0.8}Y {0.2}MnO 3 the electromagnons can be suppressedby external magnetic fields which induce a canted antiferromagnetic phase.Magnetoelectric effects in the different doping regimes are discussed indetail.



Author: A. Pimenov, A. Loidl, A. A. Mukhin, V. D. Travkin, V. Yu. Ivanov, A. M. Balbashov

Source: https://arxiv.org/







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