OXYANION DERIVATIVES OF CUPRATE SUPERCONDUCTORS - SUPERCONDUCTING 123 PHOSPHATES

被引：19

作者：

NAGARAJAN, R

AYYAPPAN, S

RAO, CNR

机构：

[1] INDIAN INST SCI, SOLID STATE & STRUCT CHEM UNIT, BANGALORE 560012, KARNATAKA, INDIA

[2] INDIAN INST SCI, MAT RES CTR, BANGALORE 560012, KARNATAKA, INDIA

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1994年 / 220卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90926-1

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

While YSr2Cu3O7 cannot be prepared under ambient conditions, partial substitution of the phosphate group for copper, as in YSr2Cu2.8(PO4)0.2Oy stabilizes this phase in the orthorhombic structure, but the material is not superconducting. Superconductivity in YSr2Cu2.8(PO4)0.2Oy is obtained by increasing the hole concentration through partial substitution of Y by Ca, as in Y0.7Ca0.3Sr2Cu2.8(PO4)0.2Oy (T(c) almost-equal-to 40 K). By incorporating the phosphate group in orthorhombic YBaSrCu3O7, a stable tetragonal derivative of the formula YBaSrCu2.8(PO4)0.2Oy (T(c) almost-equal-to 47 K) has been prepared; the T(c) increases to approximately 70 K by partial substitution of Y by Ca as in Y0.7Ca0.3BaSrCu2.8(PO4)0.2Oy.

引用

页码：373 / 376

页数：4

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