Transport properties of Ca-doped YBCO coated conductors

Author

Rutter, Noel A. ; Durrell, John H. ; Mennema, Sibe H. ; Blamire, Mark G. ; MacManus-Driscoll, Judith L.

Author_Institution

Dept. of Mater. Sci. & Metall., Univ. of Cambridge, UK

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

2570

Lastpage

2573

Abstract

The authors have doped RABiTS coated conductor tapes with Ca in an attempt to enhance the transport properties. By diffusing Ca into the YBCO film from a CaZrO₃ overlayer, the authors have been able to preferentially dope the grain boundaries of the superconductor. Hence it has been possible to obtain doped tapes which do not have a significantly degraded T_c. The authors have measured the critical currents of doped and undoped samples over a wide range of temperature, magnetic field, and magnetic field angle in order to study the effect of Ca on the grain boundaries. The authors find that doping using short anneal times produces enhanced critical currents in large magnetic fields.

Keywords

barium compounds; calcium; critical current density (superconductivity); doping; grain boundaries; grain boundary diffusion; high-temperature superconductors; superconducting tapes; superconducting thin films; superconducting transition temperature; yttrium compounds; CaZrO₃; CaZrO₃ overlayer; RABiTS coated conductor tapes; YBaCuO:Ca; critical current; doped tapes; grain boundary; magnetic field angle; short anneal times; temperature effects; transport property; Conductors; Critical current; Current measurement; Degradation; Doping; Grain boundaries; Magnetic field measurement; Superconducting films; Temperature distribution; Yttrium barium copper oxide; Ca-doping; coated conductors; grain boundaries; transport measurements;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.847654

Filename

1440191