Optical Properties of Nickel Oxide

Newman, Roger H.; Chrenko, R. M.

doi:10.1103/physrev.114.1507

Cited by 504 publications

(262 citation statements)

References 18 publications

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“…Electroreflectance spectra for bulk NiO [4] which detect the dipole-forbidden CT transitions clearly point to a forbidden transition peaked near 3.7 eV missed in reflectance and absorption spectra [3,15,16].…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the main green luminescence band peaked near 2.3 eV is attributed to a Stokesshifted 1 T 2g (D) → 3 A 2g (F ) transition while the low-energy band peaked near 1.5 eV is related [14] (see Ref. [3] for the spectrum of the crystal field d -d transitions). However, the photoluminescence spectra of bulk single crystals and ceramics of NiO under 3.81 eV photoexcitation [13] suggestive the band gap excitation have revealed in addition to the green band a more intensive broad violet PL band with a maximum around 3 eV.…”

Section: Resultsmentioning

confidence: 99%

“…At present we have no comprehensive assignment of intensive spectral features in NiO to different p-d or d -d CT transitions. The main reason for this is that the absorption coefficient rises steeply above 3.5 eV and reaches a giant value of 10 6 cm −1 at and above 4 eV [3] that complicates the detailed absorption and reflection measurements particularly near the fundamental edge. This difficulty can be avoided in part by making use of specific techniques such as electroreflectance measurements [4] or nonlinear absorption measurements [5] that are particularly effective for location of the forbidden transitions.…”

Section: Introductionmentioning

confidence: 99%

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Low-energy charge transfer excitations in NiO

Sokolov

Пустоваров

Churmanov

et al. 2012

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Comparative analysis of photoluminescence (PL) and photoluminescence excitation (PLE) spectra of NiO poly-and nanocrystals in the spectral range 2-5.5 eV reveals two PLE bands peaked near 3.7 and 4.6 eV with a dramatic rise in the low-temperature PLE spectral weight of the 3.7 eV PLE band in the nanocrystalline NiO as compared with its polycrystalline counterpart. In frames of a cluster model approach we assign the 3.7 eV PLE band to the low-energy bulk-forbidden p-d (t1g(π)-eg) charge transfer (CT) transition which becomes the allowed one in the nanocrystalline state while the 4.6 eV PLE band is related to a bulk allowed d -d (eg-eg) CT transition scarcely susceptible to the nanocrystallization. The PLE spectroscopy of the nanocrystalline materials appears to be a novel informative technique for inspection of different CT transitions. IntroductionDespite several decades of studies there is still no literature consensus on the detailed electronic structure of the prototype 3d oxide NiO, in particular, the character of the low-energy charge transfer excitations. NiO has long been viewed as a prototype "Mott insulator" [1] with a gap formed by intersite d -d charge transfer (CT) transitions, however, this view was later replaced by that of a "CT insulator" [2] with gap formed by p-d CT transitions. At present we have no comprehensive assignment of intensive spectral features in NiO to different p-d or d -d CT transitions. The main reason for this is that the absorption coefficient rises steeply above 3.5 eV and reaches a giant value of 10 6 cm −1 at and above 4 eV [3] that complicates the detailed absorption and reflection measurements particularly near the fundamental edge. This difficulty can be avoided in part by making use of specific techniques such as electroreflectance measurements [4] or nonlinear absorption measurements [5] that are particularly effective for location of the forbidden transitions.Main goal of our paper is to show with NiO as an example that the photoluminescence excitation (PLE) spectroscopy of the nanocrystalline materials appears to be a novel informative technique for inspection of different charge transfer transitions. Indeed, on the one hand, nanocrystalline state gives rise to a noticeable modification of the optical response of materials, in particular, due to an enhanced role of the surface induced local structural distortions resulting in a shift and splitting of the energy levels, and, mainly, in a liberalization of the

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-energy charge transfer excitations in NiO

Sokolov

Пустоваров

Churmanov

et al. 2012

IOP Conf. Ser.: Mater. Sci. Eng.

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“…This hill can be composed of P 2 Ni , and P 3 Ni with the same peak positions. Conventionally P 3 Ni is considered to arise from contribution of trivalent nickel species ͑Ni 3+ , excited 3d states 34,35 having 3d 7 electron configuration͒ due to the deficient nickel oxide. 31,[36][37][38] But it can be assigned to Ni͑OH͒ 2 as well as in Refs.…”

Section: Pure Nickelmentioning

confidence: 99%

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

et al. 2010

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We report on the ability to modify the structure and composition of ultrathin oxides grown on Ni and Ni-Al alloy surfaces at room temperature utilizing photon illumination. We find that the nickel-oxide formation is enhanced in the case of oxidation under photo-excitation. The enhanced oxidation kinetics of nickel in 5% Ni-Al alloy is corroborated by experimental and simulation studies of natural and photon-assisted oxide growth on pure Ni͑100͒ surfaces. In case of pure Ni substrates, combined x-ray photoelectron spectroscopy analysis, and atomic force microscope current mapping support the deterministic role of the structure of nickel passiveoxide films on their nanoscale corrosion resistance. Atomistic simulations involving dynamic charge transfer predict that the applied electric field overcomes the activation-energy barrier for ionic migration, leading to enhanced oxygen incorporation into the oxide, enabling us to tune the mixed-oxide composition at atomic length scales. Atomic scale control of ultrathin oxide structure and morphology in the case of pure substrates as well as compositional tuning of complex oxide in the case of alloys leads to excellent passivity as verified from potentiodynamic polarization experiments.

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“…Their calculated line shape closely fits the measured peak. While composite two-magnon phonon excitation has previously been observed in NiO, it is not a virtual bound state and hence is much broader in energy [32]. Apparently, an analogous two-spinon one-phonon excitation was observed in one-dimensional (1D) Sr 2 CuO 3 [33].…”

Section: Two-magnon Raman Scatteringmentioning

confidence: 82%

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

Struzhkin

Chen

2016

Low Temperature Physics

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The mechanism of high-temperature superconductivity of copper oxides (cuprates) remains unsolved puzzle in condensed matter physics. The cuprates represent extremely complicated system, showing fascinating variety of quantum phenomena and rich phase diagram as a function of doping. In the suggested "superconducting glue" mechanisms, phonon and spin excitations are invoked most frequently, and it appears that only spin excitations cover the energy scale required to justify very high transition temperature T c ~ 165 K (as in mercury-based triple layer cuprates compressed to 30 GPa). It appears that pressure is quite important variable helping to boost the T c record by almost 30 degrees. Pressure may be also considered as a clean tuning parameter, helping to understand the underlying balance of various energy scales and ordered states in cuprates. In this paper, a review of mostly our work on cuprates under pressure will be given, with the emphasis on the interactions between phonon and spin excitations. It appears that there is a strong coupling between superexchange interaction and stretching in-plane oxygen vibrations, which may give rise to a variety of complex phenomena, including the charge-density wave state intertwined with superconductivity and attracting a lot of interest recently. PACS

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Optical Properties of Nickel Oxide

Cited by 504 publications

References 18 publications

Low-energy charge transfer excitations in NiO

Low-energy charge transfer excitations in NiO

Compositional tuning of ultrathin surface oxides on metal and alloy substrates using photons: Dynamic simulations and experiments

Magnon–phonon coupling and implications for charge-density wave states and superconductivity in cuprates

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