Optical spectroscopy of the metal-insulator transition in NdNiO3

T. Katsufuji, Y. Okimoto, T. Arima, Y. Tokura, J. B. Torrance

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Abstract

We report optical measurements of NdNiO3 that undergo a phase transition from a paramagnetic metal to an antiferromagnetic insulator at 200 K (=Tc). The opening of a charge gap is observed in the optical conductivity spectrum [σ(ω)] below Tc, and the missing spectral weight is distributed over the energy region above 0.3 eV. The evolution of the gap below Tc is rather gradual with temperature, in contrast to sharp changes of lattice parameters and resistivity at Tc. Such a feature in the σ(ω) spectrum of NdNiO3 is characteristic of a spin-density-wave (SDW) state, though the peak energy (∼0.4 eV) of the σ(ω) spectrum is considerably larger than that predicted by a simple SDW theory. The effect of electron correlation is discussed on the basis of the σ(ω) spectra.

Original languageEnglish
Pages (from-to)4830-4835
Number of pages6
JournalPhysical Review B
Volume51
Issue number8
DOIs
Publication statusPublished - 1995 Jan 1

ASJC Scopus subject areas

  • Condensed Matter Physics

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