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

Abstract

We report the synthesizing and characterization of the hole doped Ni-based superconductor ($L{a}_{1-x}S{r}_x)NiAsO$. By substituting La with Sr, the superconducting transition temperature $T_c$ is increased from 2.4 K of the parent phase $LaNiAsO$ 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 $LaNiAs(O_{1-x}{F}_x)$. The normal state resistivity in Ni-based samples shows a good metallic behavior and reveals the absence of spin density wave induced anomaly which appears in the Fe-based system at about 150 K. Hall effect measurements indicate that the electron conduction in the parent phase $LaNiAsO$ is dominated by electron-like charge carriers, while with more Sr doping, a hole-like band will emerge and finally prevail over the conduction, such a phenomenon reflects that the Fermi surface of $LaNiAsO$ comprises of electron pockets and hole pockets, thus the sign of charge carriers could be changed once the contribution of hole pockets overwhelms that of electron pockets. Magnetoresistance measurements and the violation of Kohler rule provide further proof that multiband effect dominate the normal state transport of ($L{a}_{1-x}S{r}_x)NiAsO$.

5 pages, 7 figures

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Cited by in corpus (10)

• 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