<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>R</mml:mi></mml:math>-matrix approach to low-energy electron energy-loss spectroscopy from NiO

Jones, Paul; Inglesfield, J E; Michiels, J. J. M.; Noble, C. J.; Burke, V.M.; Burke, P G

doi:10.1103/physrevb.62.13508

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…13 and 14 in Ref. 12. These reasons taken together suggest that a calculation of intensities in EELS spectra of d-metal compounds is not very promising͒.…”

Section: As Followsmentioning

confidence: 91%

“…But even without those surface state contributions, the determination of intensity distributions within an EELS spectrum is a difficult task, even if the scattering mechanism is described in a more sophisticated way. The investigation of d-d exchange scattering cross sections within an R-matrix approach, as performed for NiO by Jones et al, 12 has shown that the angular intensity distribution of a single transition can be described very well, cf. Figs.…”

Section: As Followsmentioning

confidence: 99%

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Comment on “Resonant inelastic x-ray scattering of MnO:L2,3edge measurements and assessment of their interpretation”

Müller

Hüfner

2008

Phys. Rev. B

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Recently, Ghiringhelli et al. ͓Phys. Rev. B 73, 035111 ͑2006͔͒ reported on the d-d crystal field and chargetransfer excitations in MnO by using resonant inelastic x-ray scattering ͑RIXS͒. The data were analyzed with the single impurity Anderson model ͑SIAM͒ as well as with the crystal-field model ͑CFM͒, with both models providing very different parameters. The results of their CFM analysis are in conflict with the results obtained by analyzing electron-energy-loss spectroscopy ͑EELS͒ data with the same model.Transition-metal compounds have been a subject of solidstate research for a long time due to their many interesting properties. The most important one is perhaps the occurrence of what is now often called Mott insulation. 1,2 This means insulating behavior in a system with partially filled bands ͑such a system would be metallic in simple band theory͒ due to large on-site Coulomb interactions. The gap in these systems is often called a Mott gap, though matter can be more complicated. The occurrence of superconductivity in the cuprates and of very large magnetoresistance in the manganites has increased the interest in this class of compounds. 2 The low energy electronic excitations in these systems are important for the understanding of their properties. They have been investigated by optical spectroscopy, electronenergy-loss spectroscopy ͑EELS͒ and by resonant as well as nonresonant inelastic x-ray scattering ͑RIXS, NIXS͒.In a recent paper, Ghiringhelli et al. 3 presented RIXS experiments on MnO, a simple prototype transition-metal compound, measuring the d-d crystal field and charge-transfer excitations. If a new method is used to investigate an established system and the data are analyzed in a known framework, two points have to be addressed: What additional information does the new method provide, and what kind of new information does the new analysis yield? In light of this, we would like to comment on the paper by Ghiringhelli et al. 3 as follows:The RIXS technique is by no means as trivial as the authors make it look. A detailed discussion of the problems has, e.g., been given by Platzman and Isaacs. 4 The discussion of Ghiringhelli et al. 3 uses Eq. ͑5͒ of the work of Kotani and Shin 5 which contains considerable simplifications. In order to document the experimental situation, the RIXS data by Ghiringhelli et al. 3 ͑taken from 4 spectra of this work͒ are compared to the EELS data of Fromme et al. 6 and the EELS data of the present work in Table I. While there is ͑not unexpectedly͒ a good agreement between the two sets of EELS data, there are ͑surprisingly͒ deviations with respect to the RIXS data. This is probably due to the fact that the secondorder RIXS process is a quite complicated one, 4 where it is not obvious that its results must agree with those of optical or EELS experiments ͑which may be called first-order techniques͒. This problem is not addressed by Ghiringhelli et al.The second point concerns the data analysis given by Ghiringhelli et al. 3 Their data have been analyzed by the single im...

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“…13 and 14 in Ref. 12. These reasons taken together suggest that a calculation of intensities in EELS spectra of d-metal compounds is not very promising͒.…”

Section: As Followsmentioning

confidence: 91%

Section: As Followsmentioning

confidence: 99%

Comment on “Resonant inelastic x-ray scattering of MnO:L2,3edge measurements and assessment of their interpretation”

Müller

Hüfner

2008

Phys. Rev. B

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“…To check the resonance effect in the EELS measurement, the primary energy dependence of the EELS spec- tra of nickel monoxide (NiO), which has several previous SR-EELS studies with E i less than 100 eV [5,[28][29][30], has been investigated. The rEELS spectra at E i = 800 − 900 eV near the Ni 2p → 3d absorption edge are shown in Fig.…”

Section: B Reels On a Transition-metal Compound Niomentioning

confidence: 99%

Bulk-Sensitive Spin-Resolved Resonant Electron Energy-Loss Spectroscopy (SR-rEELS): Observation of Element- and Spin-Selective Bulk Plasmons

Kimura,

Kawabata,

Matsumoto

et al. 2021

Preprint

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We have developed spin-resolved resonant electron energy-loss spectroscopy (SR-rEELS) in the primary energy of 0.3-1.5 keV, which corresponds to the core excitations of 2p → 3d absorption of transition metals and 3d → 4f absorption of rare earths. Element-specific carrier and valence plasmons can be observed by using the resonance enhancement of core absorptions. Spin-resolved plasmons were also observed using a spin-polarized electron source from a GaAs/GaAsP strained superlattice photocathode. Furthermore, this primary energy corresponds to an electron penetration depth of 1 to 10 nm and thus provides bulk-sensitive EELS spectra. The methodology is expected to complement the element-selective observation of elementary excitations by resonant inelastic x-ray scattering and resonant photoelectron spectroscopy.

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“…This involved considering oriented molecules, something Phil had already done in collaboration with Karl Blum (Nordbeck et al 1993, Middleton et al 1994, and the inclusion of extra potentials, particularly the image potential due to the scattering electron (Burke et al 1999). This method was also used to develop an atomic theory of electron energy loss from transition metal oxides (Michiels et al 1997) and hence simulate spectra of CaO and NiO crystals (Jones et al 2000).…”

Section: Electron Collisions With and Photoionisation Of Molecules An...mentioning

confidence: 99%

Computational treatment of electron and photon collisions with atoms, ions, and molecules: the legacy of Philip G Burke

Bartschat

Brown²,

Hart³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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R-matrix approach to low-energy electron energy-loss spectroscopy from NiO

Cited by 8 publications

References 20 publications

Comment on “Resonant inelastic x-ray scattering of MnO:L2,3edge measurements and assessment of their interpretation”

Comment on “Resonant inelastic x-ray scattering of MnO:L2,3edge measurements and assessment of their interpretation”

Bulk-Sensitive Spin-Resolved Resonant Electron Energy-Loss Spectroscopy (SR-rEELS): Observation of Element- and Spin-Selective Bulk Plasmons

Computational treatment of electron and photon collisions with atoms, ions, and molecules: the legacy of Philip G Burke

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