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Noh, Han-Jin; Cho, E.-J.; Kim, H.-D.; Kim, J.-Y.; Min, Changwook; Park, B.-G.; Cheong, Sang‐Wook

doi:10.1103/physrevb.76.233106

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…1 (b)]. The opening of the gap E gap ∼ 0.09 eV, obtained by extrapolating the slope near the valance-band maximum to the base line, agrees with the previous photoemission results [16,27,35] and is attributed to the Ir 3+ /Ir 4+ charge ordering and Ir 4+ -Ir 4+ dimerization along the xy chains with the tetragonal distortion.…”

Section: Resultssupporting

confidence: 89%

“…The indication of MIT and the Ir 3+ /Ir 4+ charge ordering has been obtained on previous x-ray photoemission and absorption studies of CuIr 2 S 4 . [27,31,32,33,34,35] The Ir 4f core-level spectrum of the insulating phase has two components with large energy difference, consistent with the charge ordering of Ir sites. [27,35] In contrast, the core-level spectrum has not been changed against laser irradiation, while the resistivity is reduced.…”

Section: Introductionmentioning

confidence: 78%

“…[27,31,32,33,34,35] The Ir 4f core-level spectrum of the insulating phase has two components with large energy difference, consistent with the charge ordering of Ir sites. [27,35] In contrast, the core-level spectrum has not been changed against laser irradiation, while the resistivity is reduced.…”

Section: Introductionmentioning

confidence: 78%

“…or (-110) chains cause the hardgap opening of ∼ 0.09 eV, which also manifests in previous studies. [27,31,33,35] On the other hand, the peculiar in-gap state, which shows the power-law behavior with exponent n ∼ 1.3 -1.7, gives the anomalous hopping conductivity at low temperature. It has been suggested that the long-range charge ordering is destroyed by the x-ray.…”

Section: Table Ii: Best Fit Parameters Of the Model Functionmentioning

confidence: 99%

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In-gap state and effect of light illumination inCuIr2S4probed by photoemission spectroscopy

et al. 2008

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We have studied disorder-induced in-gap states and effect of light illumination in the insulating phase of spinel-type CuIr 2 S 4 using ultraviolet photoemission spectroscopy ͑UPS͒. The Ir 3+ / Ir 4+ charge-ordered gap appears below the metal-insulator transition temperature. However, in the insulating phase, in-gap spectral features with softgap are observed in UPS just below the Fermi level ͑E F ͒, corresponding to the variable range hopping transport observed in resistivity. The spectral weight at E F is not increased by light illumination, indicating that the Ir 4+ -Ir 4+ dimer is very robust, although the long-range octamer order would be destructed by the photoexcitation. Present results suggest that the Ir 4+ -Ir 4+ bipolaronic hopping and disorder effects are responsible for the conductivity of CuIr 2 S 4 .

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 78%

Section: Table Ii: Best Fit Parameters Of the Model Functionmentioning

confidence: 99%

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In-gap state and effect of light illumination inCuIr2S4probed by photoemission spectroscopy

et al. 2008

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“…Similarly the Sn 3p 3/2 peak, which is fairly broad, also shows a similar behavior with a shift to 100 meV higher BE but hardly any change in the peak widths. This is in contrast to expectations of a system undergoing a CDW transition, as typical CDW transitions show a broadening or splitting of core level peaks of metal atoms which are involved in the CDW transition [51][52][53][54]. The results suggest a very weak charge disproportionation across the CDW transition in Ce 3 Co 4 Sn 13 , although superstructure peaks were reported in diffraction studies [27].…”

Section: Resultscontrasting

confidence: 71%

Electronic structure investigation of a charge density wave coupled to a metal-to-metal transition in Ce3Co4Sn13

et al. 2018

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We study the electronic structure of the skutterudite Ce 3 Co 4 Sn 13 , which is known to exhibit a charge density wave (CDW) transition, at temperature T CDW ∼ 160 K, coupled to a metal-to-metal transition. We use temperature dependent hard x-ray photoemission spectroscopy (HAXPES) and x-ray absorption spectroscopy (XAS) to investigate the occupied and unoccupied electronic states of Ce 3 Co 4 Sn 13 . The Co 2p and Sn 3p core level spectra show small but finite shifts in binding energy positions across T CDW while Ce 3d core level spectra do not show any change across the transition. The Ce M 4,5 -edge XAS spectrum compared with calculations indicate a typical trivalent ionic Ce 3+ spectral shape, ruling out Kondo screening in Ce 3 Co 4 Sn 13 . In contrast, the Co L 2,3 -edge XAS spectrum compared with a calculated spectrum shows evidence for hybridization with neighboring Sn atoms in a trigonal prismatic co-ordination. Temperature dependent XAS across the Co L 2,3 -edge shows a small shift across T CDW , consistent with HAXPES results. Detailed XAS measurements as a function of temperature show that the spectral shifts occur with a hysteresis across T CDW , indicative of a first-order transition. Valence band spectra show a normal Fermi edge above and below T CDW . The Co 3d states are observed at a binding energy of ∼2 eV while the Ce 4f states occur as a weak feature within 0.5 eV of the Fermi level. The results suggest an unusual CDW transition coupled to a metal-to-metal transition in Ce 3 Co 4 Sn 13 .

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Structural investigation of BaIrO$$_3$$ by neutron diffraction

Chang,

Jeong,

Noh

et al. 2023

J. Korean Phys. Soc.

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We report a temperature-dependent neutron diffraction (ND) study on polycrystalline monoclinic BaIrO3 which is famous for charge density wave (CDW) and weak ferromagnetic phase transitions at TC ∼180 K simultaneously. A Rietveld analysis on the ND patterns reveals that even though there is no symmetry breaking in crystal structure, a noticeable change in the four kinds of IrO6 octahedra is isolated as the temperature approaches to TC . Based on the structure analysis results, we calculated the d-orbital energy level splittings by crystal electric field for each type of the IrO6 octahedra. By taking into account the strong spin-orbit coupling in Ir 5d orbitals and the lattice distortions obtained from the ND analysis, we propose an electronic configuration model to understand the phase transition of the system, where an effective J eff,1/2 Mott insulating phase and a charge gap phase induced by bonding states between the J eff,1/2 states compete each other.

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I3+–Ir4+charge disproportionation in spinelCu

Cited by 12 publications

References 15 publications

In-gap state and effect of light illumination inCuIr2S4probed by photoemission spectroscopy

In-gap state and effect of light illumination inCuIr2S4probed by photoemission spectroscopy

Electronic structure investigation of a charge density wave coupled to a metal-to-metal transition in Ce3Co4Sn13

Structural investigation of BaIrO$$_3$$ by neutron diffraction

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