Boron Substitution for Bi in Sr-Free Bi-2212 Superconductor of Bi2Pr0.5Ca2.5Cu2O z
Boron substitution is tried for Bi in the Sr-free Bi-2212 compound of Bi–Pr–Ca–Cu–O, and the substitution effect on superconductivity of the compound is investigated. X-ray diffraction study shows that the samples are of almost the single phase in the x range of 0.0≤x≤0.4 for the nominal composition of (Bi2−x B x )Pr0.5Ca2.5Cu2O z . Moreover, electrical resistivity and magnetic susceptibility measurements show that the superconducting transition temperature monotonously decreases with increase of x. From these results, it is first discovered that boron is a substitutable element for Bi in the Sr-free Bi-2212 compound and that the boron substitution causes the number of hole-carriers to decrease for this compound.
KeywordsBoron substitution Sr-free Bi-2212 phase Bi2Pr0.5Ca2.5Cu2Oz Superconductivity
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