Strongly correlated electron systems: Photoemission and the single-impurity model

Arko, A. J.; Joyce, J. J.; Andrews, A. Ballard; Thompson, J. D.; Smith, J. L.; Mandrus, David; Hundley, M. F.; Cornelius, Andrew; Moshopoulou, E.; Fisk, Z.; Canfield, Paul C.; Menovsky, A.A.

doi:10.1103/physrevb.56.r7041

Cited by 49 publications

(46 citation statements)

References 13 publications

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“…Here, in this correlated and multi-electronic picture, semi-isolated 4f states (at a nominal binding energy of 1 eV) are in contact with the bath of spd valence electrons, generating spectral features at the Fermi Level and at a binding energy corresponding to the depth of the bath electron well, about 2 eV below the Fermi Level in the case of Ce. This controversy has spilled over into issues such as the volume collapse associated with the alpha to gamma phase transition [17][18][19] and the electronic structure of Ce compounds [20][21][22][23]. (A more generalized schematic illustrating the competition between the bandwidth (W) and correlation strength (U) is shown in Figure 1.)…”

Section: Introductionmentioning

confidence: 99%

Spin-resolved electronic structure studies of non-magnetic systems: Possible observation of the Fano Effect in polycrystal Ce

Tobin

Morton

Chung

et al. 2006

Physica B: Condensed Matter

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Section: Introductionmentioning

confidence: 99%

Spin-resolved electronic structure studies of non-magnetic systems: Possible observation of the Fano Effect in polycrystal Ce

Tobin

Morton

Chung

et al. 2006

Physica B: Condensed Matter

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“…In the light of PAM, BE and intensity variations of these features as a function of electron wave vector k are expected being particularly strong for the Fermi-level peak. In fact, in a few cases energy dispersions [6,7,8,9,10,11] and k-dependent intensity variations [6,10,12] were reported and qualitatively interpreted in the light of PAM. A quantitative description of the phenomena in relation to the VB structure however is still lacking.…”

mentioning

confidence: 99%

Wave-vector dependent intensity variations of the Kondo peak in photoemission fromCePd3

et al. 2005

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Strong angle-dependent intensity variations of the Fermi-level feature are observed in 4d → 4f resonant photoemission spectra of CePd3 (111), that reveal the periodicity of the lattice and largest intensity close to the Γ points of the surface Brillouin zone. In the framework of a simplified periodic Anderson model the phenomena may quantitatively be described by a wave-vector dependence of the electron hopping matrix elements caused by Fermi-level crossings of non-4f -derived energy bands.PACS numbers: 71.20.Eh, 71.27.+a In Ce compounds, interaction of localized 4f states with itinerant valence-band (VB) states may lead to a number of fascinating phenomena ranging from valence instabilities to heavy-fermion and even non-Fermi-liquid behavior [1]. Although part of physical properties of these compounds may be understood in the framework of local-density approximation (LDA) band-structure calculations, the latter are not able to account properly for the correlated nature of the f electrons. For the latter, localized approaches are applied based on the Kondo or Anderson hamiltonians. Particularly application of the single-impurity Anderson model (SIAM) [2] was very successful allowing a quantitative correlation of transport, thermodynamic and magnetic properties of the materials with spectroscopic data (see, for example, Ref. 3). A shortcoming of this model, however, is its restriction to an isolated f impurity that ignores the influence of the periodicity of the lattice on the f state. Anisotropies of physical properties, therefore, are usually only discussed in terms of crystal field effects, while a k dependence of hybridization is not considered [4]. Taking into account the latter leads to the periodic Anderson model (PAM) for which, however, realistic approaches are presently still missing [5].Experimentally, in particular angle-resolved photoemission (PE) has been used to search for inconsistencies of SIAM that make use of PAM necessary. In PE spectra, the Ce 4f emissions reveal a characteristic double peak structure consisting of a spin-orbit split Fermi-level (E F ) feature related to the Kondo resonance and a broad peak at about 2 eV binding energy (BE) that corresponds roughly to the 4f 0 final state expected for photoionization of a 4f 1 ground state. In the light of PAM, BE and intensity variations of these features as a function of electron wave vector k are expected being particularly strong for the Fermi-level peak. In fact, in a few cases energy dispersions [6,7,8,9,10,11] and k-dependent intensity variations [6,10,12] were reported and qualitatively interpreted in the light of PAM. A quantitative description of the phenomena in relation to the VB structure however is still lacking.In the present Letter we report on an angle-resolved 4d → 4f resonant PE study of CePd 3 (111). This compound is characterized by a relatively low VB density of states around the Fermi energy [13] and band crossings of the Fermi level may only be observed by photoemission at certain points in k space. CePd 3 (111) re...

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“…One sees again in this view of heavy mass The key features in Fig. 3 for a dispersing formation the tendency that the basic FS topology is conduction band include: (i) the renormalization of determined by the conduction band E -crossings in f-''bands'' by ARPES, and has been used in arguadjustable parameters, but in a full microscopic ments for the (complete) failure of the single impuritreatment they are linked to the original Hamiltonian ty model [17,18]. We see here that the success of the parameters through Kondo-like relations.…”

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confidence: 99%

“…URu Si is a nominally 5f F 2 2 [15,16] and claims of ''band-like'' dispersion of system with a moderately large linear specific heat 2 f-states [17,18]. However, because of technical barcoefficient of g 5180 mJ / mol-K extrapolated from riers, ARPES has never provided enough FS detail in the paramagnetic phase [24,25].…”

mentioning

confidence: 99%

Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice

Denlinger

Gweon

Allen

et al. 2001

Journal of Electron Spectroscopy and Related Phenomena

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141

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Strongly correlated electron systems: Photoemission and the single-impurity model

Cited by 49 publications

References 13 publications

Spin-resolved electronic structure studies of non-magnetic systems: Possible observation of the Fano Effect in polycrystal Ce

Spin-resolved electronic structure studies of non-magnetic systems: Possible observation of the Fano Effect in polycrystal Ce

Wave-vector dependent intensity variations of the Kondo peak in photoemission fromCePd3

Comparative study of the electronic structure of XRu2Si2: probing the Anderson lattice

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