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Photoconductivity and Optical Conductivity in Lightly Doped Nd2CuO4-d

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Authors
Yu, G.; Lee, C. H.; Heeger, A. J.; Cheong, S. W.
Issue Date
1992
Publisher
Elsevier
Citation
Physica C 203 (1992) 419
Abstract
The photoconductivity, σph(ω), and the optical conductivity, σ(ω), of lightly-doped single crystals of Nd2CuO4−δ are compared over the photon energy range . We find that σph(ω) and σ(ω) exhibit a common edge at the charge transfer energy gap, 1.2 eV, with no indication of a significant exciton binding energy. At higher photon energies, σph(ω) follows σ(ω). At energies below the charge transfer transition, a broad spectral feature is observed in σ(ω), centered at 0.6 0.7 eV. This feature is suppressed in σph(ω), which shows a weak and relatively narrow peak at 0.7 eV at relevant temperatures. The discrepancies between σph(ω) and σ(ω) in the infrared spectral region provide evidence that the states in the CT band tails and the broad, doping-induced gap states in the CuO2 layers are localized.
ISSN
0921-4534
Language
English
URI
http://hdl.handle.net/10371/13603
DOI
https://doi.org/10.1016/0921-4534(92)90051-D
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Electrical and Computer Engineering (전기·정보공학부)Journal Papers (저널논문_전기·정보공학부)
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