Optical study of the metal-insulator transition in CuIr 2 S 4 crystals

  title={Optical study of the metal-insulator transition in CuIr 2 S 4 crystals},
  author={Nl Wang and G. Cao and P. Zheng and G. Li and Zhong Fang and Tao Xiang and Hideaki Kitazawa and T. Matsumoto},
  journal={Physical Review B},
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 $\ensuremath{\sim}2\mathrm{eV}$ are observed. In the insulating… 
In-gap state and effect of light illumination in CuIr2S4 probed by photoemission spectroscopy
We have studied disorder-induced in-gap states and effect of light illumination in the insulating phase of spinel-type ${\text{CuIr}}_{2}{\text{S}}_{4}$ using ultraviolet photoemission spectroscopy
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The thiospinel ${\mathrm{Cu}}_{1\ensuremath{-}x}{\mathrm{In}}_{x}{\mathrm{Ir}}_{2}{\mathrm{S}}_{4}(0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.25)$ system was studied by the measurements of
Density-functional study of the electronic and optical properties of the spinel compoundCuIr2S4
Using first-principles density-functional calculations we have computed the electronic and optical properties of spinel compound ${\text{CuIr}}_{2}{\text{S}}_{4}$, which undergoes a structural phase
Orbitally driven insulator-metal transition in CuIr2S4 : Temperature-dependent transient reflectivity study
Ultrafast transient reflectivity across the unusual three-dimensional Peierls-like insulator-metal (IM) transition in ${\mathrm{CuIr}}_{2}{\mathrm{S}}_{4}$ was measured as a function of temperature.
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X-Ray photoemission study of CuIr2S4: Ir3+-Ir4+ charge ordering and the effect of light illumination.
XPS measurements under laser irradiation indicate that the charge disproportionation of CuIr2S4 is very robust against photo-excitation in contrast to Cs2Au2Br6 which shows photo-induced valence transition.
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Anomalous resistivity and thermopower of the spinel-type compounds CuIr 2 S 4 and CuIr 2 Se 4
Resistivity $(\ensuremath{\rho})$ and thermopower (S) of spinel-type compounds ${\mathrm{CuIr}}_{2}{\mathrm{S}}_{4}$ and ${\mathrm{CuIr}}_{2}{\mathrm{Se}}_{4}$ have been measured at temperatures from
S K and Ir ${L}_{3}$ x-ray absorption measurements across the temperature-induced metal (M) to insulator (I) transition in ${\mathrm{CuIr}}_{2}{\mathrm{S}}_{4}$ are presented. Dramatic S K-edge
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A mechanism of the Verwey transition in magnetite $({\mathrm{Fe}}_{3}{\mathrm{O}}_{4}),$ which has been argued to be a charge ordering transition so far, is proposed. Based on mean-field calculations
X-ray-Induced Disordering of the Dimerization Pattern and Apparent Low-Temperature Enhancement of Lattice Symmetry in Spinel CuIr 2 S 4
At low temperatures, spinel ${\mathrm{CuIr}}_{2}{\mathrm{S}}_{4}$ is a charge-ordered spin-dimerized insulator with triclinic lattice symmetry. We find that x rays induce a structural transition in
Metal-insulator transition in the spinel-type CuIr2(S1-xSex)4 system
The thiospinel CuIr2S4 exhibits a temperature-induced metal-insulator (M -I) transition around 226 K, showing hysteresis on heating and cooling, that manifests itself as a gap in the electronic
Structural and magnetic studies of metal-insulator transition in thiospinel CuIr2S4
Crystal structure and magnetic susceptibility were investigated for a thiospinel compound CuIr 2 S 4 , which exhibits a transition from metallic to insulating on cooling at the transition temperature
Cu(Ir12xRhx) 2S4. The features of the M2I transition change with Rh concentration x. A phase diagram of temperature versus x will be proposed for the Cu(Ir12xRhx) 2S4 system. The sharp M2I transition
Formation of isomorphic Ir3+ and Ir4+ octamers and spin dimerization in the spinel CuIr2S4
The results indicate that CuIr2S4 undergoes a simultaneous charge-ordering and spin-dimerization transition—a rare phenomenon in three-dimensional compounds.