Narrow superconducting window in Ni-doped LaFeAsO

Abstract

We have studied Ni-substitution effect in LaFe${}_{1-x}$Ni${}_x$AsO ($0\le x\le 0.1$) 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 $0.03\le x\le 0.06$ 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 LaFeAsO${}_{1-x}$F${}_x$ system is discussed.

6 pages, 7 figures and 3 tables. Accepted for publication in PRB

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• Structural and superconducting properties in LaFeAs1-xSbxO1-yFy
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• Superconducting Mechanism through direct and redox layer doping in Pnictides