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Synthesis and characterization of the hole-doped nickel-based superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>La</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Sr</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:mtext>NiAsO</mml:mtext></mml:mrow></mml:math>
We report the synthesizing and characterization of the hole-doped Ni-based superconductor ${\text{La}}_{1\ensuremath{-}x}{\text{Sr}}_{x}\text{NiAsO}$. 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 โฆ