期刊
PHYSICAL REVIEW B
卷 69, 期 15, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevB.69.153104
关键词
-
We present measurements of the optical spectra on single crystals of spinel-type compound CuIr2S4. 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 similar to2 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 Ir3+ t(2g) state to upper Ir4+ t(2g) subband resulting from the dimerization of Ir4+ ions in association with the simultaneous formations of Ir3+ and Ir4+ 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据