TY - CHAP
T1 - HIGH T//c SUPERCONDUCTIVITIES OF A//2Ba//4Cu//6O//1//4// plus //y.
AU - Tsurumi, Shigeyuki
AU - Hikita, Makoto
AU - Iwata, Tsunekazu
AU - Semba, Kouichi
AU - Kurihara, Susumu
PY - 1987/5
Y1 - 1987/5
N2 - 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.
AB - 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.
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M3 - Chapter
AN - SCOPUS:0023348195
VL - 26
SP - 856
EP - 857
BT - Japanese Journal of Applied Physics, Part 2: Letters
ER -