Abstract
Superconductivity around 90K is observed in mixed and single phase system of LnBaCuO (Ln = Y, Ho, Er). Resistivity, X-ray powder diffraction and AC susceptibility measurements were carried out on samples of the mixed phase systems Ln 2−xBa xCuO 4−y (Ln = Ho, Er), Y 1.2Ba 0.8Cu 1+xO 4+x−y(0<x<5) and single phase system Ba 2LnCu 3O 7 (Ln = Y, Ho, Er). Ln 2−xBa xCuO 4−y consists of Ba 2LnCu 3O 7, BaCuLn 2O 5, Cu 2Ln 2O 5 and starting materials and shows a small diamagnetic signal below T c in the temperature dependent AC susceptibility. Y 1.2Ba 0.8Cu 1+xO 4+x−y is a mixture of Ba 2YCu 3O 7, BaCuY 2O 5 and CuO and also indicates a small diamagnetic signal at 92K. Interesting resistivity anomalies occur in the Y 1.2Ba 0.8Cu 4O 7−y and Ho 0.8Ba 1.2CuO 4−y composites including large drops in the resistivity at ∼220 and ∼120K, respectively. The pure compounds, Ba 2LnCu 3O 7 (Ln = Y, Ho, Er) show sharp resistive superconducting transitions and bulk Meissner effects of 90%.
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