Large-cluster effects on core-level photoemission spectra of quasi-one-dimensional copper compounds

Okada, Kozo; Kotani, Akio

doi:10.1016/s0368-2048(97)00136-9

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…A similar variation in the XPS spectrum has been observed in the copper halides on going from Br to Cl and on to F. A comparative analysis showed [4] that the charge transfer energy and, therefore, the ionicity of the Cu-O bond increase as the size of the CuO particles becomes smaller. This is fully consistent with theoretical calculations using the large cluster model [1][2][3].…”

supporting

confidence: 90%

“…It is entirely obvious that the changes with decreasing h in all the spectral parameters we have discussed obey certain laws. But, because of their extremal character, these laws are related to some other factors, besides the low-dimensional features of the CuO coating itself described in [1][2][3][4], that influence the spectral parameters in the opposite way. The critical size, h ≈ 1.8 ± 0.1 nm determines a limit at which one of these factors predominates.…”

mentioning

confidence: 99%

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X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

Fetisova

Kuznetsov

2009

J Appl Spectrosc

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UDC 543.428.3 X-ray photoelectron spectroscopy (XPS) is used to study the electronic states of copper oxide covering a thin (2.0 ± 0.5 nm) layer of ultradisperse copper. A reduction in the thickness of the CuO layer is found to cause extremal behavior in the XPS spectrum parameters as opposed to their monontonic variations for CuO nanoparticles. This behavior is explained by the competition of two factors which affect the system under study: the dimensions of the substrate material and the electrostatic field in it.

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supporting

confidence: 90%

mentioning

confidence: 99%

X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

Fetisova

Kuznetsov

2009

J Appl Spectrosc

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“…It has been pointed out recently that the effects of covalency in XAS spectra can be enhanced by nonlocal effects. 29 As was briefly mentioned above, such nonlocal effects occur in systems where the TMO 6 octahedra form interconnected networks, leading, e.g., to a broadening of the spectral features, a shift to lower energies, and an increase in intensity of the pre-edge peak in case of the O-K XAS spectra. This is seen in Fig.…”

Section: 23mentioning

confidence: 95%

Hole distribution between the Ni3dand O2porbitals inNd2−x
Hu
¹
,
Golden
²
,
Fink
³

et al. 2000
Phys. Rev. B
54
3
35
0
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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We present a joint experimental and theoretical study of x-ray absorption at the O-K and Ni-L 2,3 thresholds of Nd 2Ϫx Sr x NiO 4Ϫ␦ providing an analysis of the distribution of doped holes induced by Sr substitution between Ni 3d and O 2p orbitals. The preedge peak in the O-K x-ray absorption ͑XAS͒ spectra, reflecting holes located in the O 2p orbitals, increases monotonically with the degree of Sr doping up to the maximum doping level studied (xϭ1.4). The saturation in the relative intensity of the O-K preedge peak in the analogous lanthanum nickelate reported in the literature is shown to be most likely due to surface oxygen deficiency. Furthermore, the experimental Ni-L 2,3 XAS spectrum of the Ni͑III͒ nickelate Nd 1.1 Sr 0.9 NiO 3.95 was simulated by a cluster approach, including charge-transfer and complete multiplet interactions, and compared with the corresponding spectrum of the Ni͑III͒ system Nd 2 Li 0.5 Ni 0.5 O 4 . The 3d 7 weight in the ground state of Nd 1.1 Sr 0.9 NiO 3.95 was found to be 42%, somewhat smaller than the value of 51% found for Nd 2 Li 0.5 Ni 0.5 O 4 . This indicates the influence of nonlocal effects in x-ray-absorption spectroscopy, which, in this case is due to the increased covalency in the Sr-doped system as a result of inter-NiO 6 -cluster interaction. Such interactions are absent in Nd 2 Li 0.5 Ni 0.5 O 4 , which is characterized by having isolated NiO 6 clusters.

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“…A comparable effect has been observed in exact diagonalization studies. 19,18,30 The most important effect of the network geometry is the emergence of peak (c) in the CuO 3 chain spectrum, see Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

Cu-O network-dependent core-hole screening in low-dimensional cuprates: A theoretical analysis

2000

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We analyze the influence of the dimensionality on the Cu 2p 3/2 core level X-ray photoemission spectra of undoped cuprates. Both exchange splitting and delocalization properties are described within one framework using a multi-band Hubbard model. The spectral intensity is calculated by means of the Mori-Zwanzig projection technique for a CuO4 plaquette ('zero'-dimensional), an infinite CuO3 chain (one-dimensional), and an infinite CuO2 plane (two-dimensional). The results are compared to the spectra of Bi2CuO4, Sr2CuO3, and Sr2CuO2Cl2. Our analysis allows to distinguish between effects of the Cu-O geometry and effects from material-specific properties.

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Large-cluster effects on core-level photoemission spectra of quasi-one-dimensional copper compounds

Cited by 7 publications

References 15 publications

X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

Hole distribution between the Ni3dand O2porbitals inNd2−x
Hu
¹
,
Golden
²
,
Fink
³

et al. 2000
Phys. Rev. B
54
3
35
0
View full text Add to dashboard Cite

Cu-O network-dependent core-hole screening in low-dimensional cuprates: A theoretical analysis

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Large-cluster effects on core-level photoemission spectra of quasi-one-dimensional copper compounds

Cited by 7 publications

References 15 publications

X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

X-ray photoelectron spectroscopy analysis of electronic states in the oxide layer on an ultradisperse copper surface

Hole distribution between the Ni3dand O2porbitals inNd2−xHu1, Golden2, Fink3 et al. 2000Phys. Rev. B543350View full textAdd to dashboardCite

Cu-O network-dependent core-hole screening in low-dimensional cuprates: A theoretical analysis

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Resources

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Hole distribution between the Ni3dand O2porbitals inNd2−x
Hu
¹
,
Golden
²
,
Fink
³

et al. 2000
Phys. Rev. B
54
3
35
0
View full text Add to dashboard Cite