(MG,PB)SR2(Y,CA)CU2O7, A NEW 60-K SUPERCONDUCTOR IN THE PB-1-2-1-2 FAMILY

被引：36

作者：

LIU, HB ^{[1
]}

MORRIS, DE ^{[1
]}

SINHA, APB ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720

来源：

PHYSICA C | 1993年 / 204卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)91007-I

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

(Mg,Pb)Sr2(Y,Ca)Cu2O7, a new superconductor in the Pb-1:2:1:2 family, has been synthesized. The Y:Ca ratio and annealing conditions (oxygen pressure/temperature) have been optimized. Addition of silver oxide aids in increasing the superconducting volume fraction and raising T(c) to 60 K. Since this T(c) is comparable to that of other Pb-1:2:1:2 compounds, it is unlikely that Mg2+ replaces Cu in the CuO2 planes, in spite of its small radius (r=0.72 angstrom); in that case a substantial depression of T(c) would be expected. Instead, Mg2+ appears to go into the PbO layer in a rock-salt surrounding, in analogy with other divalent elements.

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页码：262 / 266

页数：5

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