Oxygen deficiency, stacking faults and calcium substitution in MOD YBCO coated conductors

Talantsev, E. F., Wimbush, S. C., Strickland, N. M., Xia, J. A., D'Souza, P., Storey, J. G., Tallon, J. L., Ingham, B., Knibbe, R. and Long, N. J. (2013) Oxygen deficiency, stacking faults and calcium substitution in MOD YBCO coated conductors. IEEE Transactions on Applied Superconductivity, 23 3: . doi:10.1109/TASC.2012.2233843

Author Talantsev, E. F.
Wimbush, S. C.
Strickland, N. M.
Xia, J. A.
D'Souza, P.
Storey, J. G.
Tallon, J. L.
Ingham, B.
Knibbe, R.
Long, N. J.
Title Oxygen deficiency, stacking faults and calcium substitution in MOD YBCO coated conductors
Journal name IEEE Transactions on Applied Superconductivity   Check publisher's open access policy
ISSN 1051-8223
Publication date 2013-06
Year available 2012
Sub-type Article (original research)
DOI 10.1109/TASC.2012.2233843
Open Access Status Not yet assessed
Volume 23
Issue 3
Total pages 5
Place of publication Piscataway, NJ, United States
Publisher Institute of Electrical and Electronics Engineers
Language eng
Formatted abstract
The variation in transition temperature Tc with oxygen deficiency or calcium substitution in Y1-xCaxBa2Cu3O7-δ (YBCO) is a well-known manifestation of the generic hole-doping phase diagram governing the superconducting cuprates. Less well understood is the role that microstructural defects can play in determining hole doping. We have investigated the formation of Y124-type stacking faults in metal-organic deposited (MOD) YBCO coated conductors and shown that these defects also act to reduce the hole concentration in YBCO. With low stacking-fault density, Tc can be as low as 89 K when fully oxygen loaded and can increase to a maximum of 94 K when partially unloaded. The presence of stacking faults limits the degree to which fully oxygen loaded YBCO can be overdoped. The critical current density Jc is optimized by full oxygen loading but with a moderate density of stacking faults. We have demonstrated substitution of calcium for yttrium in YBCO by modification of the MOD precursor resulting in an increase in hole concentration and consequent decrease in Tc. Jc is initially depressed by calcium substitution but partially recovers upon incorporation of a moderate density of stacking faults.
Keyword Calcium substitution
Hole concentration
Oxygen annealing
Stacking faults
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
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