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• W2003992764 abstract "We present measurements of the optical spectra on single crystals of spinel-type compound ${mathrm{CuIr}}_{2}{mathrm{S}}_{4}.$ This material undergoes a sharp metal-insulator transition at 230 K. Upon entering the insulating state, the optical conductivity shows an abrupt spectral weight transfer and an optical excitation gap opens. In the metallic phase, Drude components in low frequencies and an interband transition peak at $ensuremath{sim}2mathrm{eV}$ are observed. In the insulating phase, a peak emerges around 0.5 eV. This peak is attributed to the transition of electrons from the occupied ${mathrm{Ir}}^{3+}$ ${t}_{2g}$ state to upper ${mathrm{Ir}}^{4+}$ ${t}_{2g}$ subband resulting from the dimerization of ${mathrm{Ir}}^{4+}$ ions in association with the simultaneous formations of ${mathrm{Ir}}^{3+}$ and ${mathrm{Ir}}^{4+}$ octamers as recently revealed by the x-ray-diffraction- experiment. Our experiments indicate that the band structure is reconstructed in the insulating phase due to the sudden structural transition." @default.
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• W2003992764 date "2004-04-22" @default.
• W2003992764 modified "2023-10-16" @default.
• W2003992764 title "Optical study of the metal-insulator transition inCuIr2S4crystals" @default.
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• W2003992764 doi "https://doi.org/10.1103/physrevb.69.153104" @default.
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