PES and XAS Study on Electronic Structures of Multiferroic RMnO$_3$ (R=Y, Er)

Details PES and XAS Study on Electronic Structures of Multiferroic RMnO$_3$ (R=Y, Er) PES and XAS Study on Electronic Structures of Multiferroic RMnO$_3$ (R=Y, Er)

2004-11-22

arxiv.org/abs/cond-mat/0411561v1

Physics

Condensed Matter

Materials Science

3 figures

Scientific paper

Electronic structures of multiferroic RMnO$_3$ (R=Y, Er) have been investigated by employing photoemission spectroscopy (PES) and x-ray absorption spectroscopy (XAS). We have found that Mn ions in RMnO$_3$ are in the trivalent high-spin state with the total spin of S=2. The occupied Mn ($d_{xz} - d_{yz}$) states lie deep below $\rm E_F$, while the occupied Mn ($d_{xy} - d_{x^2 -y^2}$) states overlap very much with the O $2p$ states. It is observed that the PES spectral intensity of Mn 3d states is negligible above the occupied O $2p$ bands, suggesting that YMnO$_3$ is likely to be a charge-transfer insulator. The Mn $d_{3z^2 -r^2}$ state is mostly unoccupied in the ferroelectric phase of YMnO$_3$.

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