Superconductivities of A2//2Ba4//4Cu//6O//1//4// plus //y (0 less than y less than 2. 5, A equals lanthanides except for Pm) compounds are studied through X-ray powder diffraction pattern analysis and electrical resistance measurement. Resultant compounds in case of A equals La, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb except for Ce, Pr, Tb and Lu exhibit both characteristic diffraction patterns for A//2Ba//4Cu//6O//1//4// plus //y, i. e. , oxygen defect perovskite (ODP) and superconducting state. Key structure for realizing high Tc more than 90 K and narrow transition width is confirmed to be related with the ODP phase.
|Title of host publication||Japanese Journal of Applied Physics, Part 2: Letters|
|Number of pages||2|
|Publication status||Published - 1987 May|
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