Optical spectroscopy of the metal-insulator transition inNdNiO3
Autor: | Yasuhiro Tokura, Jerry B. Torrance, Taka-hisa Arima, Takuro Katsufuji, Yoichi Okimoto |
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Rok vydání: | 1995 |
Předmět: | |
Zdroj: | Physical Review B. 51:4830-4835 |
ISSN: | 1095-3795 0163-1829 |
DOI: | 10.1103/physrevb.51.4830 |
Popis: | We report optical measurements of ${\mathrm{NdNiO}}_{3}$ that undergo a phase transition from a paramagnetic metal to an antiferromagnetic insulator at 200 K (=${\mathit{T}}_{\mathit{c}}$). The opening of a charge gap is observed in the optical conductivity spectrum [\ensuremath{\sigma}(\ensuremath{\omega})] below ${\mathit{T}}_{\mathit{c}}$, and the missing spectral weight is distributed over the energy region above 0.3 eV. The evolution of the gap below ${\mathit{T}}_{\mathit{c}}$ is rather gradual with temperature, in contrast to sharp changes of lattice parameters and resistivity at ${\mathit{T}}_{\mathit{c}}$. Such a feature in the \ensuremath{\sigma}(\ensuremath{\omega}) spectrum of ${\mathrm{NdNiO}}_{3}$ is characteristic of a spin-density-wave (SDW) state, though the peak energy (\ensuremath{\sim}0.4 eV) of the \ensuremath{\sigma}(\ensuremath{\omega}) spectrum is considerably larger than that predicted by a simple SDW theory. The effect of electron correlation is discussed on the basis of the \ensuremath{\sigma}(\ensuremath{\omega}) spectra. |
Databáze: | OpenAIRE |
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