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.


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.

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