Ca Substitution Effect for Sr upon Superconductivity of Bi2.1CaySr1.9-yCuO6+δ

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概要

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• Physical properties of a compound expressed by Bi2.1CaySr1.9-yCuO6+δ are investigated by means of powder X-ray diffraction and magnetic measurement for as-sintered samples with varying Ca content $y$. Main crystal structure is found to be Bi-2201 phase as $y$ is increased from 0.2 to 1.9. Bulk superconductivity is obtained from magnetic measurement. The critical temperature ($T_{\text{c}}$) is almost unchanged for the samples with various $y$ in the range of 74–80 K, whereas the magnitude of diamagnetism is changed with roughly proportional to $y$ in the range of $0<y\leq 0.95$ and with abrupt decrease in $0.95<y\leq 1.8$. The results suggest a cluster model about the role of Ca/Sr mixture on the superconductivity in Bi-2201 phase.

• 2007-03-25

著者

• Yoshizaki Ryozo

  Graduate School Of Pure And Applied Sciences University Of Tsukuba

• Nakajima Tetsuya

  Graduate School Of Pure And Applied Sciences University Of Tsukuba

• Tange Masayoshi

  Graduate School Of Pure And Applied Sciences University Of Tsukuba

• TANGE Masayoshi

  Graduate School of Pure and Applied Sciences, University of Tsukuba

関連論文

• Effect of Strip Width on Low-Field Peak Effect of Critical Current Density in Bi_2Sr_2CaCu_2O_ Superconducting Strips(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
• Annealing Effect of 80 K-Class Superconductivity of Ca-Doped B2S2CuO6+\delta in Bi-2201 Phase
• Ca Substitution Effect for Sr upon Superconductivity of Bi2.1CaySr1.9-yCuO6+δ

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