Nickel substitution in Ln2Ba4Cu7−xNixO14+δ: (Ln=lanthanide, yttrium)

D.B. Currie, M.T. Weller

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The system Ln2Ba4Cu7−xNixO14+δ (247), Ln=lanthanide, yttrium, has been investigated by powder X-ray and neutron diffraction, thermogravimetric analysis and magnetic susceptibility measurements. Extended X-ray absorption fine structure (EXAFS) experiments at the Ni K-edge have been carried out on a number of the compounds. Results have shown that, as with the related material YBa2Cu3O7−δ (123), nickel doping takes place predominantly at the square pyramidal copper sites, with some occupation at the square planar sites at low dopant levels. A deterioration of the superconducting properties following introduction of nickel content is observed.
Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalPhysica C: Superconductivity and its Applications
Volume297
Issue number1-2
DOIs
Publication statusPublished - 1 Mar 1998

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