Peculiar Hole Doping by Ca Substitution in Cuprate Superconductors |
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| Authors: | J-Y Lin P C Chung S J Liu C C Hsiang P H Lin J M Lee J M Chen K H Wu Y S Gou |
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| Affiliation: | (1) Institute of Physics, National Chiao Tung University, Hsinchu, 300, Taiwan ROC;(2) Department of Electrophysics, National Chiao Tung University, Hsinchu, 300, Taiwan ROC;(3) Synchrotron Radiation Research Center (SRRC), Hsinchu, 300, Taiwan ROC |
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| Abstract: | The doping effect of Ca substitution in Y0.7Ca0.3Ba2Cu3O
y
has been studied for y=6.9 and 6 by the x-ray absorption near edge spectroscopy (XANES). While Ca doping leads to an obvious increase in hole concentration in the CuO2 planes in Y0.7Ca0.3Ba2Cu3O6.9, XANES indicates absence of this doping effect in Y0.7Ca0.3Ba2Cu3O6. These two contradict results suggest that the doping effect by Ca substitution could be sensitive to the oxygen content when y 6.0. Comparisons with others' works are made. |
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