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(Color online) XRD spectrum together with the Rietveld refinement pattern for with . The symbol “+” and the solid line represent the experimental data and the Rietveld refinement pattern, respectively. The solid line just below the XRD spectrum shows the error of the Rietveld refinement. The bars show the positions of Bragg reflections from the three phases of doped , MgO, and from top to bottom, respectively (, , ). The inset shows the amplified (002) and (110) peaks for the compounds with .
Normalized zero-field cooled magnetization vs curves for . The inset gives variation of with Ca content .
Specific heat curves of the Ca-doped at zero magnetic field.
Curves of vs the reduced temperature for samples together with the best fittings. The solid lines represent the fitting results.
Refined lattice parameters and characteristic parameters of the Ca-doped superconductor obtained from specific heat. The value is estimated from the midpoint specific heat anomaly and is estimated from the difference between the onset and the tiptop point of anomaly transition.
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