Abstract
The infrared reflectivity spectra of a ${\mathrm{Pr}}_{2}\mathrm{Ni}{\mathrm{O}}_{4+\ensuremath{\delta}}$ single crystal and its high-temperature dependence (300\char21{}1300 K) are investigated for light polarized in the basal plane. Fitting with the appropriate model allows one to discriminate localized and itinerant charge carriers. Below 720 K, a thermally activated behavior of mobile species is observed with ${E}_{a}\ensuremath{\sim}93\phantom{\rule{0.3em}{0ex}}\mathrm{meV}$ consistent with previous dc resistivity measurements. High-temperature behavior is discussed by considering oxygen loss, structural data (x-ray diffraction, neutron diffraction), and existing models developed at lower temperatures.
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