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Decrease of and persistent two gaps upon enhancement of the Ca doping in superconductor
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Image of FIG. 1.
FIG. 1.

(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 .

Image of FIG. 2.
FIG. 2.

Normalized zero-field cooled magnetization vs curves for . The inset gives variation of with Ca content .

Image of FIG. 3.
FIG. 3.

Specific heat curves of the Ca-doped at zero magnetic field.

Image of FIG. 4.
FIG. 4.

Curves of vs the reduced temperature for samples together with the best fittings. The solid lines represent the fitting results.


Generic image for table
Table I.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Decrease of Tc and persistent two gaps upon enhancement of the Ca doping in MgB2 superconductor