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Effect of High-Pressure Oxygen Annealing in Inducing Superconductivity in Calcium-Free 1212-Type Cuprate (Cd0.67Bi0.23Pb0.10)YSr2Cu2O7−δ

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Abstract

A 1212-type cuprate of nominal composition (Cd0.67Bi0.23Pb0.10)YSr2Cu2O7-δ has been synthesized. X-ray diffraction analysis of the sample showed it has tetragonal symmetry with lattice parameters a = 3.797(1) Å, and c = 11.968(3) Å. As synthesized samples as well as that annealed under flowing oxygen gas are not superconducting down to 4K. However, annealing the samples under 5MPa of oxygen at 1175 K made them superconducting at 35K as shown by AC and DC susceptibility measurements. Attempts to dope excess holes in the compound by replacing yttrium partially by calcium made the sample multiphase.

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  1. Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Mumbai, 400 085, India

    I. K. Gopalakrishnan & J. V. Yakhmi

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  1. I. K. Gopalakrishnan
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  2. J. V. Yakhmi
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Gopalakrishnan, I.K., Yakhmi, J.V. Effect of High-Pressure Oxygen Annealing in Inducing Superconductivity in Calcium-Free 1212-Type Cuprate (Cd0.67Bi0.23Pb0.10)YSr2Cu2O7−δ. Journal of Superconductivity 13, 569–573 (2000). https://doi.org/10.1023/A:1007820816890

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