Magnetic and electrical properties of ${\mathrm{La}}_{2\mathrm{-}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NiO}}_{4\pm \mathrm{\delta }}$

The magnetic properties and resistivities of the ${\mathrm{La}}_{2\mathrm{-}\mathit{x}}$ ${\mathrm{Sr}}_{\mathit{x}}$ ${\mathrm{NiO}}_4$ solid solution have been investigated with particular emphasis on conductive materials near ${\mathrm{LaSrNiO}}_4$. Near that composition, weakly temperature-dependent magnetic susceptibilities, and resistivities, similar in magnitude to those in the isostructural metallic (La,Sr${)}_2$ ${\mathrm{CuO}}_4$ compounds, are found. No superconductivity was found for the highly conductive compositions down to temperatures as low as 30 mK.