Abstract
RNiO 3 (R: rare earth) is one of the typical bandwidth-control metal–insulator transition systems. Its metal–insulator transition temperature ( T MI) is the same as the antiferromagnetic transition temperature ( T N) for R=Pr and Nd, while T MI is higher than T N for R=Sm and Eu. The boundary between the two types of phase transitions is located between NdNiO 3 and SmNiO 3. We have measured photoemission spectra of Nd 1− x Sm x NiO 3 at various temperatures above and below T MI. The spectra show quite different temperature dependences between x≤0.4 and x≥0.6. For x≤0.4, the spectral intensity near the Fermi level ( E F) is temperature-dependent even well below T MI, while for x≥0.6 it shows a significant temperature dependence only near T MI. Also, the spectra near E F above T MI show a pseudo-gap like behavior for x≥0.6. From these results, we conclude that the metallic phase has different natures between x≤0.4 and x≥0.6.
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