STRUCTURE AND SUPERCONDUCTING PROPERTIES OF A NEW FAMILY OF THALLIUM CUPRATES, TLSR3-XLNXCU2O7

被引：4

作者：

MANIVANNAN, V ^{[1
]}

RANGAVITTAL, N ^{[1
]}

GOPALAKRISHNAN, J ^{[1
]}

RAO, CNR ^{[1
]}

机构：

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

来源：

PHYSICA C | 1993年 / 208卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(93)90196-W

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Cuprates of the formula TlSr3-XLnxCu2O7 (Ln=Pr, Nd or Y) derived from the hypothetical TlSr3Cu2O7 show superconductivity with T(c)s up to 95 K when 0.5 less than or similar x less-than-or-equal-to 0.75, the x=1.0 compositions being insulators. Rietveld analysis of X-ray diffraction profiles has been carried out for two superconducting members of this family. The unit cell a-parameter, and hence the in-plane Cu-O distance, increases with increase in x. The T(c) value decreases with increase in x or the in-plane Cu-O distance in all the series of cuprates. Superconductivity in the Tl1-yPbySr3-xNdxCu2O7 system is found with the highest T(c) of 95 K when y=0.2 and x=0.5. The in-plane Cu-O distances in all the cuprates studied fall in the range found in the Sr-class of cuprate superconductors.

引用

页码：253 / 258

页数：6

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