Abstract

Structural and superconducting properties of (La2.5-xPrxNd0.5)CaBa3Cu7Oz (0≤x≤0.7) compounds have been investigated. Neutron diffraction studies reveal that these crystallize in the triple-perovskite structure (space group P4/mmm) with an oxygen content of 16.6 per formula unit nearly independent of the Pr content. The superconducting transition temperature, Tc, of x = 0 compound is ∼ 79K and decreases almost linearly with increasing x to ∼ 42K for x = 0.7. In order to see if the depression of Tc due to Pr can be compensated by Ca, we examined the compounds (La2.5-x-yPrxCayNd0.5)CaBa3Cu7Oz with x = 0.7 and y = 0 and 0.4. The observed Tc in these compounds is almost independent of Ca content suggesting the absence of a contribution from hole filling in the depression of Tc by Pr. The observed depression of Tc with increasing Pr content in the title compound is analyzed on the basis of magnetic pair breaking by the Pr-4f electrons. © 2002 Elsevier Science B.V. © 2002 Elsevier Science B.V. All rights reserved.

Department(s)

Physics

Keywords and Phrases

(La Pr Ca Nd )CaBa Cu O 2.5-x-y x y 0.5 3 7 z; Superconductivity; T suppression c

International Standard Serial Number (ISSN)

0921-4526

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 Elsevier, All rights reserved.

Publication Date

01 Mar 2002

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