Interplay of low and highT c phases in Bi-Sr-Ca-Cu-O superconductor
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Abstract
In the Bi-Sr-Ca-Cu-O system stringent conditions of heat-treatment lead to the formation of a mixture of both the low and highT c phases and obtaining a single-phase material becomes extremely difficult. This study reports preparation of samples with single superconducting transitions at ∼ 75 K and ∼ 108 K; the compositions of which correspond ton=2,3 in the series Bi2Sr2Ca n−1Cu n O4 + 2n . X-ray diffraction studies show that the lowerT c material is a relatively pure phase while the higherT c phase only co-exists with the lowerT c phase. The most obvious effect of doping the system with lead is to make the reaction take place faster and thereby increase the volume fraction of the 110K phase.
Keywords
LowTc phase highTc phase Bi-superconductorPreview
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