Narrow superconducting window in LaFe1-xNixAsO

被引：88

作者：

Cao, Guanghan ^{[1
]}

Jiang, Shuai ^{[1
]}

Lin, Xiao ^{[1
]}

Wang, Cao ^{[1
]}

Li, Yuke ^{[1
]}

Ren, Zhi ^{[1
]}

Tao, Qian ^{[1
]}

Feng, Chunmu ^{[2
]}

Dai, Jianhui ^{[1
]}

Xu, Zhu'an ^{[1
]}

Zhang, Fu-Chun ^{[1
,3
]}

机构：

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

[2] Zhejiang Univ, Test & Anal Ctr, Hangzhou 310027, Peoples R China

[3] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 17期

关键词：

doping; electrical resistivity; lanthanum compounds; magnetic susceptibility; nickel; specific heat; spin density waves; superconducting critical field; superconducting materials; X-ray diffraction; CRITICAL-FIELD; LAYERED SUPERCONDUCTOR; PHASE-DIAGRAM; TEMPERATURE; SPIN; CU;

D O I：

10.1103/PhysRevB.79.174505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied Ni-substitution effect in LaFe1-xNixAsO (0 <= x <= 0.1) by the measurements of x-ray diffraction, electrical resistivity, magnetic susceptibility, and heat capacity. The nickel doping drastically suppresses the resistivity anomaly associated with spin-density-wave ordering in the parent compound. Superconductivity emerges in a narrow region of 0.03 <= x <= 0.06 with the maximum T-c of 6.5 K at x=0.04, where enhanced magnetic susceptibility shows up. The upper critical field at zero temperature is estimated to exceed the Pauli paramagnetic limit. The much lowered T-c in comparison with LaFeAsO1-xFx system is discussed.

引用

页数：6

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