Effects of cobalt doping and phase diagrams of LFe1-xCoxAsO (L=La and Sm)

被引：179

作者：

Wang, C. ^{[1
]}

Li, Y. K. ^{[1
]}

Zhu, Z. W. ^{[1
]}

Jiang, S. ^{[1
]}

Lin, X. ^{[1
]}

Luo, Y. K. ^{[1
]}

Chi, S. ^{[1
]}

Li, L. J. ^{[1
]}

Ren, Z. ^{[1
]}

He, M. ^{[1
]}

Chen, H. ^{[1
]}

Wang, Y. T. ^{[1
]}

Tao, Q. ^{[1
]}

Cao, G. H. ^{[1
]}

Xu, Z. A. ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 05期

基金：

美国国家科学基金会;

关键词：

antiferromagnetic materials; cobalt compounds; doping; electrical resistivity; iron compounds; lanthanum compounds; magnetic susceptibility; phase diagrams; samarium compounds; spin density waves; superconductivity; thermoelectric power; CU-O; SUPERCONDUCTIVITY; OXIDES; INSTABILITY; METAL;

D O I：

10.1103/PhysRevB.79.054521

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The superconducting phase diagrams have been established by the measurements of electrical resistivity, magnetic susceptibility, and thermopower in cobalt-doped LFeAsO (L=La and Sm) systems. It is shown that the antiferromagnetic spin-density-wave order in the parent compounds is rapidly suppressed by Co doping, and superconductivity emerges at x=0.025 and 0.05 in LaFe1-xCoxAsO and SmFe1-xCoxAsO, respectively. The T-c(x) curves of both systems are domelike, with a maximum T-c of 13 K at x=0.075 in LaFe1-xCoxAsO and 17.2 K at x=0.1 in SmFe1-xCoxAsO. Thermopower measurement shows dominant electron-type transport for the Co-doped samples, in accordance with itinerant character of Co 3d electrons. We found a close correlation between T-c and the abnormally enhanced part of normal-state thermopower. The occurrence of superconductivity via the Fe-site doping in the iron-based oxyarsenide contrasts sharply with the destruction of superconductivity by the Cu-site (within CuO2 planes) doping in high-temperature superconducting cuprates.

引用

页数：9

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