期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 463, 期 -, 页码 64-67出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2007.05.044
关键词
valence of Ce; Vegard's law; T-structure; T '-structure
We have recently successfully doped the La site in T-La2CuO4 with Cc by a molecular beam epitaxy. The resultant T-La2-xCexCuO4 was insulating up to x = 0.06. This is in sharp contrast to T'-La2-xCexCuO4, which is superconducting with a T-c of about 30 K. In order to clarify the difference between T-La2-xCexCuO4 and T'-La2-xCexCuO4, we estimate the valences of Ce in T-La2-xCexCuO4 and T'-La2-xCexCuO4 by using Vegard's law. The estimated valence of Ce is >=+3.84 in T-La2-xCexCuO4 and similar to+3.78 in T'-La2-xCexCuO4. The result indicates that electron doping is actually achieved in T-La2-xCexCuO4, but that this compound remains an insulator. This contradicts the general belief that the doping with either electrons or holes conducts or superconducts parent compounds. (C) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据