The Decomposition of YBa₂Cu₃O₇₋δ Doped into Ba₂YRuO₆

H. A. Blackstead
William B. Yelon, Missouri University of Science and Technology
M. Kornecki
M. P. Smylie
P. J. McGinn
Jinbo Yang
Qingsheng Cai
William Joseph James, Missouri University of Science and Technology

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One of the persistent criticisms of claims for observation of superconductivity in Ba2YRu1−uCuuO6 (O6) is that the diamagnetism is actually due to the decomposition of the material into YBa2Cu3O7−delta and other phases. We report a series of experiments in which YBa2Cu3O7−delta is doped into Ba2YRuO6 and carried through a series of sintering steps which were followed by magnetization, neutron diffraction, and scanning electron microscopy/microprobe measurements. It was found that the dopant YBa2Cu3O7−delta decomposed and failed to reform with cooling. It is concluded that the O6 phase is the stable high-temperature phase. The Cu released from the Y123 decomposition doped the host Ba2YRuO6, in partial substitution for Ru. This doping resulted in a small diamagnetic response with an onset temperature of ~84 K.