Electromagnons in the multiferroic state of perovskite manganites with symmetric-exchange striction - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




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Abstract: We have investigated electrically-active magnetic excitationselectromagnons in perovskite manganites with the $E$-type up-up-down-downspin structure by terahertz spectroscopy. Eu$ {1-x}$Y$ x$MnO$ 3$ 0.1$\lex\le$1 and Y$ {1-y}$Lu$ y$MnO$ 3$ 0$\le y\le$1 without magnetic $f$-moments,which host collinear sinusoidal, $A$-type, cycloidal, and $E$-type spin orders,are used to examine the systematics of possible electromagnons. Three-peakstructures 23, 35, 45 cm$^{-1}$ of magnetic origin show up in the $E$-typephase with little composition $y$ dependence of frequencies, making acontrast with the electromagnons observed in the cycloidal-spin $x\le0.8$phases. One of these electromagnon is ascribed to the zone-edge magnon modebased on the calculated magnon dispersions.



Author: Y. Takahashi, S. Ishiwata, S. Miyahara, Y. Kaneko, N. Furukawa, Y. Taguchi, R. Shimano, Y. Tokura

Source: https://arxiv.org/







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