Abstract
The single-phase samples of Y 0.9 Ca 0.1 Ba 2-y La y Cu 3 O z and Y1-x Ca x Ba 1.5 La 0.5 Cu 3 O z were synthesized with both x and y from 0 to 0.5, respectively. Structural and superconducting properties have been investigated by X-ray diffraction, Rietveld refinement, and DC magnetization measurement, respectively. Different from the self-compensating compound of Y 1-x Ca x Ba 2-x La x Cu 3 O z, carriers in these two systems of Y1-x Ca x Ba 2-y La y Cu 3 O z are not compensated as x ≠ y. By careful study of the chemical bond lengths related to Cu (2)– O plane and Cu (1)– O chain, it is demonstrated that the critical temperature (Tc) changes monotonously with the bond lengths of Cu (1)– O (4) and Cu (2)– O (4). The analysis demonstrates that crystalline structure is one of the important factors to high-Tc superconductivity, and its influence is independent of the carrier concentration.
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