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Proceedings Paper

Distorted local environment about Zn and transition metals on the copper sites in YBa2Cu3O7
Author(s): Frank Bridges; Guoguang Li; James B. Boyce; Tord Claeson
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Paper 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.

Paper Details

Date Published: 1 November 1991
PDF: 9 pages
Proc. SPIE 1550, X Rays in Materials Analysis II: Novel Applications and Recent Developments, (1 November 1991); doi: 10.1117/12.49469
Show Author Affiliations
Frank Bridges, Univ. of California/Santa Cruz (United States)
Guoguang Li, Univ. of California/Santa Cruz (United States)
James B. Boyce, Xerox/Palo Alto Research Lab. (United States)
Tord Claeson, Chalmers Univ. of Technology (Sweden)

Published in SPIE Proceedings Vol. 1550:
X Rays in Materials Analysis II: Novel Applications and Recent Developments
Dennis M. Mills, Editor(s)

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