Cluster model description of polarized Cu K-edge spectra of Nd[sub 2[minus]x]Ce[sub x]CuO[sub 4[minus][delta]]
- Sam Houston State Univ., Huntsville, TX (United States). Dept. of Physics
- Univ. of Texas, Austin, TX (United States). Dept. of Physics
- Texas A and M Univ., College Station, TX (United States). Optical Imaging Lab.
Single crystals Nd[sub 2[minus]x]Ce[sub x]CuO[sub 4[minus][delta]] with x = 0.0 and 0.2 are studied by polarized X-ray absorption measurements at Cu K-edge. The positions and intensities of the 1s [r arrow] 4p[sub [sigma]] transition features in the K-edge spectra are analyzed with a modified cluster model and functional curve fitting procedure. All of the experimental results including the energies of the spectral features, the energy separations between features and the variation of feature intensities, can be well explained by the cluster model parameters obtained from the curve fitting. Particularly, it is found that the charge transfer energy gap [Delta] in the Nd[sub 2[minus]x]Ce[sub x]CuO[sub 4[minus][delta]] system decreases from about 1.4 eV at x = 0 to 0.5 eV at x = 0.2. The analysis in this paper provides a method for quantitative X-ray absorption spectroscopy (XAS) study of the charge transfer gap for electron-doped cuprate superconductors and related materials.
- OSTI ID:
- 6333775
- Report Number(s):
- CONF-980291--
- Journal Information:
- International Journal of Modern Physics B, Journal Name: International Journal of Modern Physics B Vol. 12:29-31; ISSN IJPBEV; ISSN 0217-9792
- Country of Publication:
- United States
- Language:
- English
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CHARGE CARRIERS
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