Abstract
We have investigated the electronic structure of La 1 - x Pr x CoO 3 and NdCoO 3 studied by photoemission spectroscopy at 200 K using several photon energies over the Pr or Nd 4d–4f resonance. All the spectra except near the 4d–4f on-resonance displayed a distinct sharp peak at ∼ 1 eV due to the Co 3 d 6 low-spin (LS) and/or intermediate-spin (IS) state. This 1-eV peak in PrCoO 3 and NdCoO 3 was substantially narrower than that of LaCoO 3 , indicating that the IS–LS mixed state is realized in LaCoO 3 at 200 K while the pure LS state persists in the others. We point out that the line shape of the Pr 4f partial density of states (PDOS) of PrCoO 3 , extracted from the on- and off-resonance spectra, was quite different from that of PrMnO 3 but rather similar to that of PrBa 2 Cu 3 O 7 .
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