LEAD-MERCURY-BASED SUPERCONDUCTORS - THE 1212-CUPRATE PB0.7HG0.3SR2+XCA0.7ND0.3-XCU2O7-DELTA AND THE NEW OXYCARBONATE PB0.7HG0.3SR4CU2CO3O7

被引：49

作者：

MARTIN, C ^{[1
]}

HERVIEU, M ^{[1
]}

HUVE, M ^{[1
]}

MICHEL, C ^{[1
]}

MAIGNAN, A ^{[1
]}

VANTENDELOO, G ^{[1
]}

RAVEAU, B ^{[1
]}

机构：

[1] UNIV ANTWERP,B-2020 ANTWERP,BELGIUM

来源：

PHYSICA C | 1994年 / 222卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)90109-0

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new superconducting mercury oxycarbonate, Pb0.7Hg0.3Sr4Cu2CO3O7, has been synthesized. This tetragonal phase (a = 3.824 angstrom, c= 16.468 angstrom) consists of an intergrowth of two nonsuperconducting compounds, Sr2CuO2CO3 and Pb0.7Hg0.3Sr2CuO5. It exhibits after optimization a critical temperature of 70 K, with a sharp transition and a superconducting volume fraction of 50%. Its behavior can be compared to that of thallium oxycarbonates previously isolated. This study is completed by a reinvestigation of the 1212 cuprate of the system Hg-Pb-Sr-Ca-Nd-Cu. A superconducting phase with the 1212 structure, similar to that previously obtained but with a significantly different composition, Pb0.7Hg0.3Sr2+xCa0.7Nd0.3-xCu2O7, has been obtained, with a T(c onset) of 100 K. The behavior of the latter is compared with other lead-based 1212 cuprates.

引用

页码：19 / 26

页数：8

共 25 条

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