A NEW 1212 MERCURY-BASED 90-K SUPERCONDUCTOR - Y0.6CA0.4BA2[HG1-XMX]O6+Y

被引：36

作者：

MAIGNAN, A

VANTENDELOO, G

HERVIEU, M

MICHEL, C

RAVEAU, B

机构：

[1] Laboratoire CRISMAT, ISMRA/Université de Caen, 14050 Caen Cedex, Boulevard du Maréchal Juin

来源：

PHYSICA C | 1993年 / 212卷 / 1-2期

关键词：

Annealing - Copper oxides - Crystal growth - Crystal structure - Crystals - Diamagnetism - Magnetic properties - Phase transitions - Superconducting transition temperature - Superconductivity - Synthesis (chemical) - Yttrium compounds;

D O I：

10.1016/0921-4534(93)90510-W

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new mercury-based superconductor, Y0.6Ca0.4Hg1-xMxCu2O6+y with M = Cu + Ca, has been isolated. It crystallizes in the space group P4/mmm with a = 3.870 (1) angstrom, c= 12.5 37 (1) angstrom. The EDX analysis, combined with XRD and HREM investigations, demonstrates that this cuprate belongs to the 1212 series. Its structure can be described as built up from the classical double pyramidal copper layers intergrown with oxygen-deficient rock-salt-type layers containing besides Hg other cations (Cu, Ca) in small amounts. The great similarity of this phase with 121 2 lead cuprates is emphasized. Susceptibility measurements show a T(conset) of 90 K, with a diamagnetic volume fraction of 27% at 4.2 K. Different annealings under higher oxygen pressure, up to 25 bar, do not improve the critical temperature.

引用

页码：239 / 244

页数：6

共 19 条

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