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High Temperature Superconductors in the La1+xBa2-xCu3Oy System

Published online by Cambridge University Press:  28 February 2011

E. M. McCarron III ,
C. C. Torardi ,
J. P. Attfield ,
K. J. Morrissey ,
A. W. Sleight ,
D. E. Cox ,
R. K. Bordia ,
W. E. Farneth ,
R. B. Flippen  and
M. A. Subramanian
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E. M. McCarron III
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
C. C. Torardi
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
J. P. Attfield
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
K. J. Morrissey
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
A. W. Sleight
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
D. E. Cox
Affiliation:
Physics Department, Brookhaven National Laboratory, Upton, NY 11973
R. K. Bordia
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
W. E. Farneth
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
R. B. Flippen
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
M. A. Subramanian
Affiliation:
Central Research and Development Department##, E. I. du Pont de Nemours and Company, Experimental Station, Wilmington, Delaware 19898
E. Lopdrup
Affiliation:
Physics Department, University of Virginia, Charlottesville. VA 22906
S. J. Poon
Affiliation:
Physics Department, University of Virginia, Charlottesville. VA 22906
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Abstract

In the perovskite-related La/Ba/Cu oxide system, the lanthanum ions can substitute on the barium sites due to a close match in the ionic radius of the two. Thus it is possible to make a solid solution La1+xBa2-xCu3Oy where O ∼ x ≤ 0.5 and y ∼ 7. For the Ba-rich end member composition (x ∼ 0). the structure is orthorhombic. but as the La content increases and La begins to substitute on the Ba sites (disordered), the crystal symmetry changes from orthorhombic to tetragonal. In addition, the superconducting properties vary with increasing La content. In particular, the superconducting onset temperature is found to decrease linearly from 80 to 45 K over the compositional (x) range 0.0 → 0.375. In the La-rich limit (x = 0.5). 1/4 of the Ba atoms are replaced by La and superconductivity is lost. A correlation between oxygen ordering (annealing) and high Tc is observed for orthorhombic LaBa2Cu3Oy and inferred in the case of tetragonal La1.25Ba1.75Cu3Oy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 99: Symposium AA – High-Temperature Superconductors , 1987 , 101
Copyright
Copyright © Materials Research Society 1988

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References

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