Abstract
Dielectric permittivity spectra of yttrium-doped in the composition range 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 axis. Well-defined electromagnons exist for close to and with dielectric strength strongly increasing on doping. In addition to electromagnons, a broad contribution of magnetoelectric origin is observed for all compositions. For , 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.
2 More- Received 24 July 2007
DOI:https://doi.org/10.1103/PhysRevB.77.014438
©2008 American Physical Society