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2005
ACL
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B.Rousseau, D.De Sousa Meneses, A.Blin, M.Chabin, P.Echegut, P.Odier, F.Gervais, 'High-temperature behavior of infrared conductivity of a Pr2NiO4+d single crystal', Phys. Rev. B 72 104114 (2005) doi:10.1103/physrevb.72.104114
The infrared reflectivity spectra of a Pr2NiO4+delta single crystal and its high-temperature dependence (300-1300 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)similar to 93 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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