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KMID : 0380319930520010139
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Journal of Korean Research Institute for Better Living
1993 Volume.52 No. 1 p.139 ~ p.148
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Comparative Analysis between the Characteristics of Ceramic Superconductor YBa2-xSrxCu3O7_y and YBa2_xCaxCu3O7_y
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Abstract
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Abstract-Ceramic superconductors YBa2-x(A)sCu3O7-y, where A=Ca or Sr, were made for several different values of X
X-ray powder diffraction, SEM, magnetigation, and resistivity versus temperature measurements were carried out to study the effects of Ca and Sr substitutions into 1 : 2 : 3 type superconductors on the superconducting characteristics.
Both ca and Sr substitutions were observed to observed to suppress the critocal temperature strongly, but Sr substitution seem to the more effective in the suppression mechanism.
The decrease of Tc seems to be due to the change in oxygen concentration induced by the Ca and/or Sr substitution.
This implies that the variation of critical temperature has close relation with that of mobile hole concentration in the Cu-O planes.
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