The structures of Nd1+xBa2-xCu3O7-δ (x = 0.05, 0.22, 0.42) phases refined from X-ray single-crystal data

D. V. Fomichev, O. G. D'yachenko, A. V. Mironov, E. V. Antipov

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Crystal structures of Nd1+xBa2-xCu3O7-δ phase (x=0.05, 0.22 and 0.42) were refined from X-ray single-crystal data (tetragonal system, space group P4/mmm, Z=1, R=0.027, 0.027, 0.025 respectively). The main differences between these similar structures deal with the cation and oxygen sites in the (Ba/NdO) layer. Joint occupation of the same site by Ba and Nd ions with essentially different ionic radii results in the splitting of that site along the c-axis and the shift of the oxygen in this layer from the ideal position at the four-fold axis to achieve appropriate coordination for the smaller rare earth cation. These changes may be the structural reason for the suppression of superconductivity in R1+xBa2-xCu3O7-δ (R is rare earth) phases.

Original languageEnglish
Pages (from-to)25-33
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume225
Issue number1-2
DOIs
Publication statusPublished - 10 May 1994
Externally publishedYes

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