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Critical Currents of Overdoped Co-evaporated YBCO Coated Conductors

Published online by Cambridge University Press:  17 March 2011

Jens Hänisch ,
Jonathan Storer ,
Chris Sheehan ,
Yates Coulter  and
Vladimir Matias
Jens Hänisch
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, 87545
Jonathan Storer
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, 87545
Chris Sheehan
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, 87545
Yates Coulter
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, 87545
Vladimir Matias
Affiliation:
Superconductivity Technology Center, Los Alamos National Laboratory, Los Alamos, NM, 87545
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Abstract

Coated conductor samples, prepared by reactive co-evaporation, are investigated with respect to the hole-doping dependence of the critical current density. The samples are annealed in an atmosphere of variable oxygen content after which critical currents, critical temperature and the c-axis lattice spacing are measured. The lattice spacing increases with decreasing oxygen content, consistent with literature data. These co-evaporated samples show hole overdoped behavior with respect to the maximum Tc. The achievable range of hole doping in these samples seems to depend on surface coverage. Both self-field and in-field Jc at 75.5 K have a maximum in the overdoped region but at less than maximum oxygen content. The reason for the overdoping of these samples is discussed briefly in terms of Y-Ba disorder.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1001: Symposium M – Progress in High-Temperature Superconductors , 2007 , 1001-M14-04
Copyright
Copyright © Materials Research Society 2007

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