The resistivity of Ba2YCu3Ox was measured in the 450–850 °C range at various oxygen partial pressures. The tetragonal to orthorhombic phase transition is observed as a change in the slope of the resistivity curve. The lack of a discontinuity in the curve is consistent with the phase transition being higher than first order. It was found that decreasing the oxygen content x below 6.2 changed the resistivity of the tetragonal phase from metallic character to semiconducting character. In the metallic region of the tetragonal phase the superconducting transition temperature is depressed below 60 K, while in the semiconducting region, no superconducting onset was observed down to 6 K. In the orthorhombic phase, the resistivity of the material is shown to be governed by the number of oxygens per unit cell, suggesting that the resistivity can serve as a quality control parameter in the production of superconducting devices.
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5 October 1987
Research Article|
October 05 1987
High‐temperature resistivity of the Ba2YCu3Ox superconductor
G. Sageev Grader;
G. Sageev Grader
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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P. K. Gallagher;
P. K. Gallagher
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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E. M. Gyorgy
E. M. Gyorgy
AT&T Bell Laboratories, Murray Hill, New Jersey 07974
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Appl. Phys. Lett. 51, 1115–1117 (1987)
Article history
Received:
July 27 1987
Accepted:
August 17 1987
Citation
G. Sageev Grader, P. K. Gallagher, E. M. Gyorgy; High‐temperature resistivity of the Ba2YCu3Ox superconductor. Appl. Phys. Lett. 5 October 1987; 51 (14): 1115–1117. https://doi.org/10.1063/1.98757
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