Synthesizing and characterization of hole doped nickel based layer superconductor (La${}_{1-x}$Sr${}_x$)ONiAs

Abstract

We report the synthesizing and characterization of the hole doped Ni-based superconductor ($L{a}_{1-x}S{r}_x)ONiAs$. By substituting La with Sr, the superconducting transition temperature $T_c$ is increased from 2.75 K of the parent phase $LaONiAs$ to 3.7 K at the doping levels x= 0.1 - 0.2. The curve $T_c$ versus hole concentration shows a symmetric behavior as the electron doped samples $La(O_{1-x}{F}_x)NiAs$. The normal state resistivity in Ni-based samples shows a good metallic behavior and reveals the absence of an anomaly which appears in the Fe-based system at about 150 K, suggesting that this anomaly is not a common feature for all systems. Hall effect measurements indicate that the electron conduction in the parent phase $LaONiAs$ is dominated by electron-like charge carriers, while with more Sr doping, a hole-like band will emerge and finally prevail over the conduction, and accordingly the superconducting transition temperature $T_c$ increases.

4 pages, 5 figures

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• Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F
• Superconductivity in SrNi2As2 Single Crystals
• Superconductivity and the Effects of Pressure and Structure in Single Crystalline SrNi${}_2$P${}_2$
• Ni${}_2$X${}_2$ (X=pnictide, chalcogenide, or B) Based Superconductors
• Electron-Phonon Properties of Pnictide Superconductors
• Crystal and magnetic structure of the superconductor CeNi${}_{0.8}$Bi${}_2$
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Structural study on hole-doped superconductors Pr1-xSrxFeAsO
• Fully gapped superconductivity in Ni-pnictide superconductors BaNi2As2 and SrNi2P2
• Increased hole mobility in anti-ThCr${}_2$Si${}_2$-type La${}_2$O${}_2$Bi co-sintered with alkaline earth metal oxides for oxygen intercalation and hole carrier doping