Relationship between the Auger line shape and the electronic properties of graphite

Houston, Jack E.; Rogers, J.W.; Rye, R. R.; Hutson, F. L.; Ramaker, David E.

doi:10.1103/physrevb.34.1215

Cited by 109 publications

(28 citation statements)

References 63 publications

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“…Concerning the lineshapes, the most striking feature is the narrow structure at 240 eV, which also appears as a shoulder in the spectrum reported by Houston et al [8]. This peak was assigned to a plasmon replica of the main structure at 265 eV produced by a plasmon with an energy ω p = 27 eV.…”

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confidence: 54%

“…In particular the Auger lineshape is proportional to the 2-particle interacting DOS as a consequence of two valence holes creation on the same lattice site caused by the X-ray photoemission of a deep core electron. Several attempts have been made to interpret the Auger spectra of amorphous graphite [8] and highly oriented pyrolitic graphite (HOPG) [9] but a satisfactory description is still to come. Moreover only few experimental data on single wall carbon nanotubes (SWCNTs) Auger lineshape are available [9].…”

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confidence: 99%

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Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

et al. 2007

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We have determined the screened on-site Coulomb repulsion in graphite and single wall carbon nanotubes by measuring their Auger spectra and performing a new theoretical analysis based on an extended Cini-Sawatzky approach where only one fit parameter is employed. The experimental lineshape is very well reproduced by the theory and this allows to determine the value of the screened on-site repulsion between 2p states, which is found to be 2.1 eV in graphite and 4.6 eV in nanotubes. The latter is robust by varying the nanotube radius from 1 to 2 nm.Carbon nanostructures continue to be an intense field of both fundamental and applied research because of the recent discoveries of several of their unusual physical properties. Among these one can recall (i) the observation of the anomalous integer quantum Hall effect in planar graphene [1,2] (ii) the measurement of superconductivity at 11.5 K in Ca intercalated graphite and (iii) intrinsic superconductivity in multi-wall[5] and ultra-small[4] carbon nanotubes at temperatures of 12 and 15 K respectively. In the light of these unprecedented properties and related new physics, the study and the quantitative estimate of electronic correlations in these carbon nanostructures are of paramount fundamental importance. In fact, in one-dimensional conductors, like metallic nanotubes, the electronic interactions have a dramatic impact on their electronic properties, giving rise to the so-called Luttinger liquid behavior. This manifests in the power-law dependence of observables such as the tunneling density of states (DOS), of which suppression at low energies has been observed in conductance measurements [6,7]. More importantly the accurate estimate of the screened Coulomb repulsion is a challenging problem that should be dealt within any theoretical study aiming at addressing the question of superconductivity.Auger electron spectroscopy is a powerful experimental tool which permits the characterization of the effective interaction between electrons in solids. In particular the Auger lineshape is proportional to the 2-particle interacting DOS as a consequence of two valence holes creation on the same lattice site caused by the X-ray photoemission of a deep core electron. Several attempts have been made to interpret the Auger spectra of amorphous graphite [8] and highly oriented pyrolitic graphite (HOPG) [9] but a satisfactory description is still to come. Moreover only few experimental data on single wall carbon nanotubes (SWCNTs) Auger lineshape are available [9]. Furthermore, no theoretical effort introducing Coulomb repulsion in SWCNTs has been attempted so far.

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confidence: 54%

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confidence: 99%

Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

et al. 2007

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“…In the case of HOPG, we use the DOS from Ref. [7] which is taken from experiments. For SWCNTs we performed a tight binding calculation on a (10,10) tube [whose diameter is about 1.4nm] by including both 2s and 2p orbitals, but neglecting overlap integrals for simplicity.…”

Section: Discussionmentioning

confidence: 99%

“…For the Auger matrix elements, we use the values A ssss = 0.8, A sspp = 0.5, A pppp = 1.0 obtained by atomic calculations [7] and hence apply to both HOPG and SWCNTs.…”

Section: Discussionmentioning

confidence: 99%

Experimental and theoretical study of electronic correlations in carbon nanotubes and graphite from auger spectroscopy

Perfetto

Cini

Ugenti

et al. 2008

J. Phys.: Conf. Ser.

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“…This correspondence between DOS and carbon KVV spectra was observed and studied by Lascovich and coauthors [10], where the validity of the weak interaction between holes is the energy region next to the Fermi level ( band). On the other hand, some theoretical efforts have also been made in understanding the experimental Auger spectra, starting from known principles of electronic states [14,15].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Stress in the Density of States of Amorphous Carbon Films Determined by X-Ray Excited Auger Electron Spectroscopy

Barbieri

Marques

2017

Advances in Materials Science and Engineering

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Amorphous carbon films can be prepared with a large variety of structure and have been used in a number of technological applications. Many of their properties have been determined, but very little is known concerning the effect of pressure on their properties. In this work we investigate the influence of pressure of graphite-like amorphous carbon films on the density of states (DOS) using X-ray Excited Auger Electron Spectroscopy (XAES) and the second derivate method of the XAES. The films were deposited by ion beam deposition and simultaneously bombarded with argon, which is responsible for the variation of the film stress, reaching extremely high values (4.5 GPa). Marked variations of the density of states of the , , sp, and s components were observed with increasing stress.

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Relationship between the Auger line shape and the electronic properties of graphite

Cited by 109 publications

References 63 publications

Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

Electronic correlations in graphite and carbon nanotubes from Auger spectroscopy

Experimental and theoretical study of electronic correlations in carbon nanotubes and graphite from auger spectroscopy

The Effect of Stress in the Density of States of Amorphous Carbon Films Determined by X-Ray Excited Auger Electron Spectroscopy

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