Single-layer oxychloride superconductor Ca2-xCuO2Cl2 with A-site cation deficiency -: art. no. 224503

被引：19
作者：
Yamada, I [1 ]
Belik, AA
Azuma, M
Harjo, S
Kamiyama, T
Shimakawa, Y
Takano, M
机构：
[1] Kyoto Univ, Inst Chem Res, Uji, Kyoto 6110011, Japan
[2] Japan Sci & Technol Corp, PRESTO, Kawaguchi, Saitama 3320012, Japan
[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan
来源：
PHYSICAL REVIEW B | 2005年 / 72卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.72.224503
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
An oxychloride superconductor Ca2-xCuO2Cl2 with a single CuO2 plane in the unit cell was prepared without cation substitution using high-pressure synthesis. The highest T-C was 38 K, 10 K higher than that of Ca2-xNaxCuO2Cl2. Structure analysis based on synchrotron x-ray and neutron powder diffractions revealed that the Ca deficiency was the origin of the hole carrier. This compound has two structural features as compared to Ca2-xNaxCuO2Cl2; fewer defects and a shorter Cu-Cl bond length. Postannealing at 773 K led to a further increase of the T-C to 43 K. This superconductor with a flat CuO2 plane might form the basis for future discussions about the factors that determine the T-C of single-layer cuprates.
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