Kumar, Shiva and Mudgel, Monika and Husain, M. and Awana, V. P. S. and Kishan, H. (2010) Superconductivity in Pb-1212–Cu1−xPbxSr2Y0.6Ca0.4Cu2O7 (x = 0.5–0.9). Physica C: Superconductivity, 470 (1). S205-S206. ISSN 0921-4534

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We report synthesis and superconductivity of Pb-1212–Cu1−xPbxSr2Y0.6Ca0.4Cu2O7 (x = 0.5–0.9) compounds. These compounds were synthesized through solid-state reaction route with optimized sintering temperatures and conditions. In particular, one needs to employ reducing atmosphere conditions to achieve superconductivity in higher Pb content samples. The X-ray diffraction (XRD) patterns reveals that all the compounds are crystallized in space group P4/mmm RE-123 structure. Superconductivity at 56 K (onset) is achieved for Pb content as high as 90%. Our study reveals that superconductivity and structure stabilization in Pb-based are more critical to synthesizing conditions than other cuprates. It is concluded that superconductivity can be introduced in Pb-1212 compounds by synthesizing the same in reducing atmosphere and thus the Pb in lower (<+4) valence state. This ensures the replacement of Cu–Ox chains of RE-123 by Pb–Ox sheets acting as charge reservoir carrier donating blocks.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier B.V.
Subjects: Physics
Depositing User: Ms Neetu Chandra
Date Deposited: 13 Jul 2012 12:33
Last Modified: 13 Jul 2012 12:33
URI: http://npl.csircentral.net/id/eprint/340

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