X-ray diffraction patterns of samples .
Variations of the - and -axis lattice parameters and the lattice cell volume as a function of doping level .
(a) HRTEM image of a single crystal selected from the powder of the doped sample with and the corresponding (b) -zone-axis electron diffraction pattern and (c) energy dispersion spectrum for the selected area.
Raman spectra of with different doping contents.
Raman spectrum of the doped with . The open circle represents the measurement data, and the solid curve is the fitting result.
Double doping content dependence of the Raman peak position of .
Temperature dependence of the resistivity for with different doping concentrations.
Dependence of superconducting transition temperature on double doping level .
Variation of the corrected superconducting transition temperature with the ionic size variance for samples.
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