Tc reduction in Sr-substituted Y(Ba1-xSrx)2Cu3O7- δinvestigated by 63,65Cu nuclear quadrupole resonance

X. N. Ying, B. Q. Li, Y. H. Liu, Y. N. Huang, Y. N. Wang

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3 Scopus citations

Abstract

We report 63,65Cu nuclear quadrupole resonance (NQR) spectra of Sr-substituted Y(Ba1-xSrx)2Cu3O7- δ at room temperature. The chemical pressure effect associated with Sr substitution leads to the results that the planar Cu(2) NQR signals are shifted to higher frequencies and the chain Cu(1) NQR signals are shifted to lower frequencies. With Sr substitution, the 63,65Cu NQR linewidths increase significantly for both the Cu(2) plane site and Cu(1) chain site, and a new Cu NQR peak appears, which we expect, originates from partial oxygen disorder in the CuOx chain layers. We expect that Tc reduction with Sr substitution in Y123 is due to carrier inhomogeneous distribution and localization caused by the partial oxygen disorder in the CuOx chain layers, or the suppression of the resonant tunneling between the CuO2planes.

Original languageEnglish
Article number012506
Pages (from-to)125061-125064
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume66
Issue number1
DOIs
StatePublished - Jul 1 2002
Externally publishedYes

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