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Type: Artigo de periódico
Title: A study of the mechanism of suppression of superconductivity by Pr3+ substitution for Ba2+ in the YBCO(123) system
Author: Gaur, SK
Singhal, RK
Garg, KB
Shripathi, T
Deshpande, UP
Bittar, EM
Pagliuso, PG
Saitovitch, EMB
Abstract: We present a systematic structural, transport, iodometric, susceptibility and x-ray photoemission study of the Y( Ba-1- xPr(x)) 2Cu3O7-delta system for chi = 0.00, 0.025, 0.05, 0.075 and 0.10 with Pr3+ ( smaller in ionic radii but higher in valence than Ba2+) substituted at the Ba site. It is successfully shown that a higher valence cation can be substituted for a lower valence one. The rate of the Tc depression in these is observed to be much higher than that in the case when Pr3+ is substituted at the Y3+ site. This is explained as being due to a composite effect of the depletion of itinerant holes due to the progressive depletion of the oxygen content in the samples, the Pr 4f-O 2p hybridization and change in the in-plane coherence length (xi(ab)) resulting from change in the in-plane atomic distances, using Ginzburg-Landau theory.
Country: Inglaterra
Editor: Iop Publishing Ltd
Rights: fechado
Identifier DOI: 10.1088/0953-8984/19/32/326201
Date Issue: 2007
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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