Physics

Mott insulator

Chemical physics

Chemistry

Materials science

Insulator (electricity)

Condensed matter physics

Superconductivity

Optoelectronics

Doping

Physical review. B./Physical review. B

Motivated by analyses of the reported electrical resistivity and Hall coefficient data in the normal state, the authors propose that the parent compound of the newly discovered superconducting nickelate Nd${}_{1\ensuremath{-}x}$Sr${}_{x}$NiO${}_{2}$ is a self-doped Mott insulator, in which the low-density Nd $5d$ conduction electrons couple to localized Ni 3${d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ electrons to form Kondo spin singlets at low temperature. The antiferromagnetic long-range order is suppressed and an insulator-metal transition results.

Self-doped Mott insulator for parent compounds of nickelate superconductors