论文信息 - The Effect of Substitution of La for Ba and Ce for Y on the Tc of Superconducting Ba2YCu3O7

The Effect of Substitution of La for Ba and Ce for Y on the Tc of Superconducting Ba2YCu3O7

It was found that La3+ enters the Ba-site of the high Tc superconductor Ba2YCu3O7-δ but Ce4+ does not enter the Y-site. Replacement of a small amount of Ba by La raises the transition temperature, Tc, but further increase of the La content results in a significant drop of the transition temperature. These results are interpreted in relation to the distribution of oxygen vacancy.

Tetsuro Nakamura | Y. Inaguma | R. Liang | Y. Takagi

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[2] Chu,et al. Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure. , 1987, Physical review letters.