Apical Cu-O bond in YBa2Cu3O7-δ superconductors by XAFS

E. A. Stern*, M. Qian, Y. Yacoby, S. M. Heald, H. Maeda

*Corresponding author for this work

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35 Scopus citations

Abstract

Careful Cu K-edge X-ray absorption fine structure (XAFS) measurements on oriented powders of YBa2Cu3O7-δ were made as a function of temperature, of δ, Tc, method of preparation and grain size. The XAFS data were analyzed for the Cu(1)-O(4) apical bond distance distribution. All samples indicated evidence for a double-peak in the distribution with a splitting of 0.1Å, with the clearest case for the δ ≈ 0 samples occuring for the Tc = 89K 20μm grain samples and the least clear one for the 5μm grain Tc = 93K sample. There is no significant temperature dependence of the splitting. Because the XAFS evidence for the splitting depends on a small signal, it is prudent to verify its existence by other independent measurements.

Original languageEnglish
Pages (from-to)331-334
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume209
Issue number1-3
DOIs
StatePublished - 20 Apr 1993

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