1 November 1991 Distorted local environment about Zn and transition metals on the copper sites in YBa2Cu3O7
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Abstract
Zn, Ni, Co, and Fe substitute for Cu in YBaCu3O7 and strongly suppress the transition temperature Tc. Surprisingly, Zn at low concentrations suppresses Tc the most and Tc goes to 0 at 8 - 10% Zn. There is still controversy as to the Zn site -- plane sites Cu(2) or chain sites Cu(1). We present x-ray absorption data (XAFS) for several concentrations of Zn and for samples from four different sources. The XAFS data indicate that many samples have significant ZnO contamination. Analysis of samples for which the ZnO contamination is negligible indicates that the Zn is mostly on the planes but displaced along the c-axis.
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Frank Bridges, Guoguang Li, James B. Boyce, Tord Claeson, "Distorted local environment about Zn and transition metals on the copper sites in YBa2Cu3O7", Proc. SPIE 1550, X Rays in Materials Analysis II: Novel Applications and Recent Developments, (1 November 1991); doi: 10.1117/12.49469; https://doi.org/10.1117/12.49469
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Zinc

Copper

Zinc oxide

Chemical species

Technetium

Fourier transforms

Nickel

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