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Research PapersNo Access

SUBSTITUTION EFFECT IN Pr-DOPED YBCO

School of Sciences, Lanzhou University of Technology, Lanzhou, 730050, People's Republic of China

Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People's Republic of China

Corresponding author.

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School of Sciences, Beijing University of Aeronautics & Astronautics, Beijing 100083, People's Republic of China

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Materials Physics Laboratory, State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, People's Republic of China

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https://doi.org/10.1142/S0217979206034893Cited by:0 (Source: Crossref)

Abstract

A series of samples of Y_1-xPr_xBa₂Cu₃O_y (YPrBCO) with 0.05 ≤ x ≤ 0.6 was synthesized and characterized by DC magnetization, X-ray diffraction (XRD), and Rietveld refinement. It is found that besides Pr substitution for Y, a part of Pr substituted for Ba in YBa₂Cu₃O_y (YBCO), and the amount of Pr in the Y and Ba positions, respectively, is estimated by the refinement with the help of bond valence sum (BVS) calculation. By comparing the correlation of structural changes such as Ba-O(4) and Cu(1, 2)-O(4) bond lengths and superconductivity between our system with the reference system where Pr just replaces Y, structural evidences are found to explain Pr substitution for Ba suppresses T_c more strongly than that for Y.

Keywords:

PACS: 74.72.Bk, 74.62.Dh, 74.62.Bf, 61.66Fn

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Vol. 20, No. 20

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Received 31 July 2005

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