Effects of excess oxygen content on the hole-carrying CuO2-layers in Tl2(Ba1−xSrx)2Ca2Cu3Oy superconducting oxides |
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| Authors: | Yasushi Idemoto Mitsuru Matsuzawa Ken Takeuchi Chun-K Loong |
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| Affiliation: | a Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan
b Intense Pulsed Neutron Source Division, Argonne National Laboratory, Argonne, IL 60439-4814, USA |
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| Abstract: | The effects of oxygen doping on the hole-carrying CuO2-layers in Tl2(Ba1−xSrx)2Ca2Cu3Oy were studied by combined chemical and valence analysis, Tc measurements and neutron diffraction. The highest Tc is characterized by an optimal excess oxygen content, Δy, dichotomizing the under- and over-doped regions for each Sr concentration. While the average Tl valence is close to 3.0 and independent of Δy, the average Cu valence shows a linear dependence with Δy. An increase of the flatness of the CuO2 plane, characterized by the O(2)-Cu(2)-O(2) bond angle of ∼176°, was observed at the optimal Δy. |
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| Keywords: | 74.72.Jt 91.60.Ed 61.12.Ld 82.80.&minus d |
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