Electric-dipole active two-magnon excitation in {\textit{ab}} spiral spin phase of a ferroelectric magnet Gd$_{\textbf{0.7}}$Tb$_{\textbf{0.3}}$MnO$_{\textbf 3}$

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dc.creatorKida, N.
dc.creatorYamasaki, Y.
dc.creatorShimano, R.
dc.creatorArima, T.
dc.creatorTokura, Y.
dc.date2008-11-25
dc.date.accessioned2026-07-07T10:36:33Z
dc.date.available2026-07-07T10:36:33Z
dc.descriptionA broad continuum-like spin excitation (1--10 meV) with a peak structure around 2.4 meV has been observed in the ferroelectric $ab$ spiral spin phase of Gd$_{0.7}$Tb$_{0.3}$MnO$_3$ by using terahertz (THz) time-domain spectroscopy. Based on a complete set of light-polarization measurements, we identify the spin excitation active for the light $E$ vector only along the a-axis, which grows in intensity with lowering temperature even from above the magnetic ordering temperature but disappears upon the transition to the $A$-type antiferromagnetic phase. Such an electric-dipole active spin excitation as observed at THz frequencies can be ascribed to the two-magnon excitation in terms of the unique polarization selection rule in a variety of the magnetically ordered phases.
dc.description11 pages including 3 figures
dc.identifierhttps://arxiv.org/abs/0811.4098
dc.identifierhttp://arxiv.org/abs/0811.4098
dc.identifierJ. Phys. Soc. Jpn. 77, 123704 (2008)
dc.identifierdoi:10.1143/JPSJ.77.123704
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/180089
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleElectric-dipole active two-magnon excitation in {\textit{ab}} spiral spin phase of a ferroelectric magnet Gd$_{\textbf{0.7}}$Tb$_{\textbf{0.3}}$MnO$_{\textbf 3}$
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