The EXAFS study of substitutional Fe in Y-Ba-Cu-O system

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Modern Physics Letters B; (USA)

DOI:https://doi.org/10.1142/S0217984990000684· OSTI ID:6516842

Dong, J; Lu, K; Zhao, B ^[1]

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1. Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080 (CN)

Near neighboring structures around Fe in YBa{sub 2}(Cu{sub 1{minus}y}Fe{sub x}){sub 3}O{sub 7{minus}y} with nominal values of x = 0.07 and 0.10, were determined using extended X-ray absorption fine structure measurements. The results show that substitutional Fe cations are located at Cu(1) site, and essential structures around Fe are similar to those around Cu(1) in YBa{sub 2}Cu{sub 3}O{sub 7{minus}y}, but bond lengths of FeO(4) and Fe-O(1) are shrunk as compared with those of Cu(1)-O(4) and Cu(1)-O(1) in YBa{sub 2}Cu{sub 3}O{sub 7{minus}y} due to the substitution of Cu by Fe. The interesting result is that extra oxygen anions are introduced located at O(5) sites near the substitutional Fe cation and the number of these oxygen anions apparently increases with the content of Fe in the compounds. It can be estimated that substitutional Fe in Y-Ba-Cu-O system has statistical sense. In combination with the superconductivity in these compounds, it is suggested that Cu-O structure on the basal plane of unit cell in YBa{sub 2}Cu{sub 3}O{sub 7{minus}y} plays an important role in high-T{sub c} superconductivity.

• OSTI ID: 6516842
• Journal Information: Modern Physics Letters B; (USA), Journal Name: Modern Physics Letters B; (USA) Vol. 4:8; ISSN MPLBE; ISSN 0217-9849
• Country of Publication: United States
• Language: English

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ABSORPTION SPECTRA
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