Abstract
ESR, X-ray diffraction and resistivity measurements were carried out for as-sintered Ba2Y1Cu3Ox, quenched Ba2Y1Cu3Ox and as-sintered Ba2Y1Cu3OxFy. The ESR spin density is found to be a good measure for the amount of an impurity phase Ba1Y2Cu1O5. A decrease in the sintering temperature reduces the amount of the impurity phase. A transition from a superconducting orthorhombic to a nonsuperconducting tetragonal structure induces no large change in the ESR signal. It is also found that an as-sintered Ba2Y1Cu3OxFy superconductor shows a strong ESR signal originating mainly from the impurity phase.
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