Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-28
Phys. Rev. B 69, 153104 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, to be published in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.69.153104
We present measurements of the optical spectra on single crystals of spinel-type compound \cis. 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 $\sim 2 eV$ are observed. In the insulating phase, a new peak emerges around $0.5 eV$. This peak is attributed to the transition of electrons from the occupied Ir$^{3+}$ $t_{2g}$ state to upper Ir$^{4+}$ $t_{2g}$ subband resulting from the dimerization of Ir$^{4+}$ ions in association with the simultaneous formations of Ir$^{3+}$ and 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.
Cao G.-H.
Fang Zhong
Kitazawa Hideaki
Li Gaojun
Matsumoto Toshio
No associations
LandOfFree
Optical study of the metal-insulator transition in CuIr$_2$S$_4$ crystals does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Optical study of the metal-insulator transition in CuIr$_2$S$_4$ crystals, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical study of the metal-insulator transition in CuIr$_2$S$_4$ crystals will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-396603