Proper composition for superconductivity in Pb(Ba, Sr)2(Y, Ca)Cu3O7
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説明
Abstract Superconductivity and composition analysis of PbBaSr(Y, Ca)Cu 3 O y with fixed ratio of Sr/Ba = 1 were studied. Synthesis condition and superconductivity of Pb(Ba, Sr) 2 (Y, Ca)Cu 3 O y with various ratio of Sr/Ba and Ca/Y were also studied. It was found that T c increased with increasing Ca concentration, and that Sr-rich specimens allowed to contain more Ca. PbBa 0.8 Sr 1.2 Y 0.6 Ca 0.4 Cu 3 O 7 showed superconductivity with zero-resistance temperature of 42 K, which was higher than PbBaSrY 0.7 Ca 0.3 Cu 3 O 7 with maximum Ca content for Sr/Ba = 1. Decrease in averaged ionic radii of Ba and Sr in Sr-rich compositions would be favorable for the contraction of Cu-O bonds by hole-doping via Ca substitution for Y.
収録刊行物
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- Physica C: Superconductivity
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Physica C: Superconductivity 170 437-442, 1990-10-01
Elsevier BV