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For most metals, increasing temperature (T) or disorder will quicken electronscattering. This hypothesis informs the Drude model of electronic conductivity.However, for so-called bad metals this predicts scattering times so short as toconflict with Heisenberg's uncertainty principle. Here we introduce therare-earth nickelates (RNiO_3, R = rare earth) as a class of bad metals. Westudy SmNiO_3 thin films using infrared spectroscopy while varying T anddisorder. We show that the interaction between lattice distortions and Ni-Obond covalence explains both the bad metal conduction and the insulator-metaltransition in the nickelates by shifting spectral weight over the large energyscale established by the Ni-O orbital interaction, thus enabling very low\sigma while preserving the Drude model and without violating the uncertaintyprinciple.

Origins of bad metal conductivity and the insulator-metal transition in the rare-earth nickelates