Electronic ground state of heavily overdoped nonsuperconducting ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x{\mathrm{CuO}}_4$

We report detailed thermodynamic and transport measurements for nonsuperconducting ${\mathrm{La}}_{1.7}{\mathrm{Sr}}_{0.3}{\mathrm{CuO}}_4.$ Collectively, these data support the presence of a highly correlated Fermi-liquid ground state in ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x{\mathrm{CuO}}_4$ beyond the superconducting dome, and imply that charge transport in the cuprates is dominated at finite temperatures by electron-electron scattering.