High-Tc superconductivity induced by doping rare-earth elements into CaFeAsF

被引：86

作者：

Cheng, Peng ^{[1
]}

Shen, Bing

Mu, Gang

Zhu, Xiyu

Han, Fei

Zeng, Bin

Wen, Hai-Hu

机构：

[1] Chinese Acad Sci, Natl Lab Superconduct, Inst Phys, Beijing 100190, Peoples R China

来源：

EPL | 2009年 / 85卷 / 06期

关键词：

D O I：

10.1209/0295-5075/85/67003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have successfully synthesized the fluoride-arsenide compounds Ca1-xRExFeAsF (RE = Nd, Pr; x= 0, 0.6). The X-ray powder diffraction confirmed that the main phases of our samples are Ca1-xRExFeAsF with the ZrCuSiAs structure. By measuring resistivity, superconductivity was observed at 56K in Nd-doped and 52 K in Pr-doped samples with x=0.6. Bulk superconductivity was also proved by the DC magnetization measurements in both samples. Hall effect measurements revealed hole-like charge carriers in the parent compound CaFeAsF with a clear resistivity anomaly below 118 K, while the Hall coefficient RH in the normal state is negative for the superconducting samples Ca0.4Nd0.6FeAsF and Ca0.4Pr0.6FeAsF. This indicates that the rare-earth element doping introduces electrons into CaFeAsF, which induces high-temperature superconductivity. Copyright (C) EPLA, 2009

引用

页数：4

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