Narrow superconducting window in LaFe1-xNix AsO

Authors

Guanghan Cao, Zhejiang University
Shuai Jiang, Zhejiang University
Xiao Lin, Zhejiang University
Cao Wang, Zhejiang UniversityFollow
Yuke Li, Zhejiang University
Zhi Ren, Zhejiang University
Qian Tao, Zhejiang University
Chunmu Feng, Zhejiang University
Jianhui Dai, Zhejiang University
Zhu-An Xu, Zhejiang University
Fu-Chun Zhang, Zhejiang University

RIS ID

70051

Publication Details

Cao, G., Jiang, S., Lin, X., Wang, C., Li, Y., Ren, Z., Tao, Q., Feng, C., Dai, J., Xu, Z. & Zhang, F. (2009). Narrow superconducting window in LaFe1-xNix AsO. Physical Review B: Condensed Matter and Materials Physics, 79 (17), 174505-1-174505-6.

Abstract

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 Tc 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 Tc in comparison with LaFeAsO1−xFx system is discussed.