TITLE

Improved strong magnetic field performance of low angle grain boundaries of calcium and oxygen overdoped YBa[sub 2]Cu[sub 3]O[sub x]

AUTHOR(S)
Daniels, George A.; Gurevich, Alex; Larbalestier, David C.
PUB. DATE
November 2000
SOURCE
Applied Physics Letters;11/13/2000, Vol. 77 Issue 20
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Critical currents and extended voltage-current characteristics of [001] tilt, low angle boundaries in thin film bicrystals of pure YBa[sub 2]Cu[sub 3]O[sub x] and Y[sub 0.7]Ca[sub 0.3]Ba[sub 2]Cu[sub 3]O[sub x] in strong magnetic fields (H<10 T) have been measured. For 5°[001] tilt boundaries, there are clear benefits to Ca additions, particularly when the sample is oxygen treated to further overdope the sample after growth. Ca-doping decreases excess grain boundary resistance and diminishes the gap between inter- and intragrain current density over a wide field and temperature range. In spite of the lower T[sub c] of the 0.3 Ca-doped samples, Ca doping increases the intergrain critical current density at 44 K as high as 30% over 0-3 T and threefold at 5 T. © 2000 American Institute of Physics.
ACCESSION #
4413857

 

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