用电子顺磁共振和静磁化率研究Co掺杂CeFeAsO的磁性

低温物理学报 , 2011, 33(6): 439-444.

用电子顺磁共振和静磁化率研究Co掺杂CeFeAsO的磁性

孙彬 ^1, , 吕艳娣 ^2, , 冷荣军 ^3, , 阮可青 ^4,

1.中国科学技术大学物理学院物理系,合肥230026

2.中国科学技术大学物理学院物理系,合肥230026

3.中国科学技术大学物理学院物理系,合肥230026

4.中国科学技术大学物理学院物理系,合肥230026

关键词：电子顺磁共振强度 , g因子 , 静态磁化率 , 线宽

MAGNETIC PROPERTY IN Co-DOPED CeFeAsO STUDIED BY ELECTRON PARAMAGNETIC RESONANCE AND STATIC SUSCEPTIBILITY

Keywords： ESR intensity , g factor , △Hpp , susceptibility

我们合成了不同CO掺杂浓度的CeFe1-xCoxAsO,并测量其电输运性质和静磁化率．最佳掺杂浓度为x（CO）=0．15，且超导温度Tc=11．3K．超导电性发生在很窄的掺杂范围内．静磁化率和电子顺磁共振测量显示在0．15和0．2两个组分样品中存在磁扰动．磁扰动与顺磁存在竞争关系．

Here we report the synthesis and basic characterization of CeFe1-xCoxAsO for several values of x. Replacing Fe with Co is expected to make electron-dope to the system and introduce disorder in the FeAs layer. For x 0. 15 superconductivity is observed at Tconset = 11.3 K. Superconductivity is not observed for x = 0. 05 and 0. 1. Superconductivity occurs at narrow Co doping regime. Furthermore, susceptibility and electron spin resonance measurements suggest strong magnetic frustration exists in both x=0. 15 and x=0. 2 samples around antiferromagnetic ordering. Ferromagnetic fluctuation coexists and competes with electron paramagnetism.

参考文献

上一张下一张

计量

下载量()
访问量()

作者相关

文章评分

您的评分：
1

0%
2

0%
3

0%
4

0%
5

0%

材料期刊网