Record number :
48296
Title of article :
Frontier electronic energy levels of tetrahedral (Td) fullerenes
Author/Authors :
Cheng، Wei نويسنده , , Li، Qian Shu نويسنده , , Tang، Au Chin نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Pages :
-300
From page :
301
To page :
0
Abstract :
Fluorine 1s and Cu 2p core level binding energies of (Tl0.5Pb0.5)Sr1.6Ba0.4Ca2Cu3Oy/Fx for nominal x=0.0, 1.0, 2.2 and 3.0 were measured by X-ray photoelectron spectroscopy (XPS) in order to identify the F site in the overdoped superconductors. Detailed data analysis indicate that about two thirds of the incorporated F replace O in Cu-O planes of the Tl-1223 structure. Most of the remaining one third of F replaces O in the Ba/Sr-O planes and a small amount of F substitutes for O in the Tl/Pb-O planes of Tl-1223 structure. Cu 2p3/2 binding energy was found to be decreasing with increasing x. This indicates that the valency of Cu in Tl-1223/Fx decreases as x increases. The reduction of charge carriers in the overdoped high temperature superconductors is discussed in terms of anion substitution.
Keywords :
Frontier electronic energy levels , Irreducible representations , Tetrahedral fullerenes , Hückel approximation , Electronic spectra
Journal title :
JOURNAL OF ELECTRON SPECTROSCOPY & RELATED PHENOMENA
Journal title :
JOURNAL OF ELECTRON SPECTROSCOPY & RELATED PHENOMENA
Serial Year :
2000
Link To Document :
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