Abstract
The charge-transfer (CT) type excitations from 0 2p to Cu 3d and to Cu 4s states have been observed around 1.5 eV and 5.0 eV, respectively, in the T’-phase cuprates Ln2CuO4 where Ln=Pr, Nd, Sm, Eu or Gd. Strong dependences of the CT excitation energies on Ln species indicate the crucial effect of the in-plane Cu-O bond length variation on the electronic states in the CuO2-sheets.
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References
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T. Arima, K. Kikuchi, M. Kasuya, S. Koshihara, Y. Tokura, T.Ido, and S.Uchida, submitted to Phys. Rev. B.
The result does not agree well with the data by S.L. Cooper et. al., [Phys. Rev. B42, 10785 (1990)] The difference seems to come from the accuracy of K-K analyses: the photon energy region for the measured reflectivity data used in the K-K transformation is ≤ 2.5 eV for their case, but ≤ 35 eV for our case.
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© 1992 Springer-Verlag Berlin, Heidelberg
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Arima, T., Ido, T., Kikuchi, K., Koshihara, S., Uchida, S., Tokura, Y. (1992). Cu-O Bond Length Dependence of Optical Properties in T’-Phase Single Crystals. In: Iye, Y., Yasuoka, H. (eds) The Physics and Chemistry of Oxide Superconductors. Springer Proceedings in Physics, vol 60. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-77154-5_34
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DOI: https://doi.org/10.1007/978-3-642-77154-5_34
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