High-pressure synthesis of a new oxycarbonate superconductor CCa3Cu2O7+delta

被引：12

作者：

Matveev, AT ^{[1
]}

Matsui, Y ^{[1
]}

Yamaoka, S ^{[1
]}

TakayamaMuromachi, E ^{[1
]}

机构：

[1] NATL INST RES INORGAN MAT,TSUKUBA,IBARAKI 305,JAPAN

来源：

PHYSICA C | 1997年 / 288卷 / 3-4期

关键词：

oxycarbonate superconductor; CCa3Cu2O7+delta; high-pressure synthesis; HRTEM;

D O I：

10.1016/S0921-4534(97)01481-0

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new oxycarbonate superconductor CCa3Cu2O7+delta (CCa2CaCu2O7+delta, C-1212) with T-c = 47 K was synthesized at 6 GPa and 1275 degrees C. It is the first superconductor which contains only Ca as the A-site cation. X-ray powder diffraction and HRTEM studies indicated that this phase has a M-1212 type structure with a = 3.842(1) and c = 10.336(1) Angstrom. The metal site in the charge reservoir is occupied only by C without partial replacement of Cu. Carriers are created by excess-oxygen atoms probably introduced into the charge reservoir. (C) 1997 Elsevier Science B.V.

引用

页码：185 / 189

页数：5