Electronic structure of correlated electron materials from photoemission in high-quality single crystals

Arko, A. J.; Joyce, John J.; Moore, D. P.; Sarrao, J. L.; Morales, Luis; Durakiewicz, Tomasz; Fisk, Z.; Koelling, D. D.; Olson, C. G.

doi:10.1016/s0368-2048(01)00256-0

Cited by 15 publications

(11 citation statements)

References 65 publications

(45 reference statements)

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“…In the simplest case the f electrons are assumed dispersionless, the hybridization purely local, and the d-electron hopping nonzero only between nearest-neighbor sites. However, for real systems this is an oversimplification since there is experimental evidence for ͑i͒ a weak, but finite dispersion of the f electrons, especially in uranium compounds, [2][3][4] ͑ii͒ nonlocal contributions to the hybridization, and ͑iii͒ hopping of the d electrons beyond nearest neighbors. 5 Recently the PAM was employed to study the dramatic volume collapse at the ␣ → ␥ transition in cerium compounds.…”

Section: Introductionmentioning

confidence: 99%

Exact ground states of the periodic Anderson model inD=3dimensions

Gulácsi

Vollhardt

2005

Phys. Rev. B

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We construct a class of exact ground states of three-dimensional periodic Anderson models ͑PAMs͒, including the conventional PAM, on regular Bravais lattices at and above 3 / 4 filling, and discuss their physical properties. In general, the f electrons can have a ͑weak͒ dispersion, and the hopping and the nonlocal hybridization of the d and f electrons extend over the unit cell. The construction is performed in two steps. First the Hamiltonian is cast into positive semidefinite form using composite operators in combination with coupled nonlinear matching conditions. This may be achieved in several ways, thus leading to solutions in different regions of the phase diagram. In a second step, a nonlocal product wave function in position space is constructed which allows one to identify various stability regions corresponding to insulating and conducting states. The compressibility of the insulating state is shown to diverge at the boundary of its stability regime. The metallic phase is a non-Fermi-liquid with one dispersing and one flat band. This state is also an exact ground state of the conventional PAM and has the following properties: ͑i͒ it is nonmagnetic with spin-spin correlations disappearing in the thermodynamic limit, ͑ii͒ density-density correlations are short ranged, and ͑iii͒ the momentum distributions of the interacting electrons are analytic functions, i.e., have no discontinuities even in their derivatives. The stability regions of the ground states extend through a large region of parameter space, e.g., from weak to strong on-site interaction U.

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Section: Introductionmentioning

confidence: 99%

Exact ground states of the periodic Anderson model inD=3dimensions

Gulácsi

Vollhardt

2005

Phys. Rev. B

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“…The shortcomings of this treatment of the PES data for correlated electron systems have been well documented. [10][11][12][13] The PAM model takes into account the coherent nature of electrons, thus, it may better describe the strong correlation of electrons in lattice systems. The complex nature of PAM calculations requires the application of some generalizations such as infinite dimensions, but initial results give certain general conclusions such as smaller temperature dependence of the f -band and its hybridization with conduction states.…”

Section: Introductionmentioning

confidence: 99%

Angle-resolved photoemission study ofUSb2: The5fband structure

et al. 2004

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Single crystal antiferromagnetic USb 2 was studied at 15 K by angle-resolved photoemission with an overall energy resolution of 24 meV. The measurements unambiguously show the dispersion of extremely narrow bands situated near the Fermi level. The peak at the Fermi level represents the narrowest feature observed in 5 f -electron photoemission to date. The natural linewidth of the feature just below the Fermi level is not greater than 10 meV. Normal emission data indicate a three dimensional aspect to the electronic structure of this layered material.

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“…The c-f hybridization-derived electronic structure has been verified by ARPES studies [2][3][4][5][6][7][8][9][10][11][12][13] . However, most of those studies have been performed on the basis of the surface Brillouin zone (BZ) [2][3][4][5][6] or by using the 4d-4f resonant process [7][8][9] , in which k z (the momentum normal to surface) dependence on the electronic structure is neglected owing to its quasi-two-dimensionality. In general, ARPES along the bulk BZ with well-defined k z should be ideal for the three-dimensional materials.…”

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confidence: 99%

Strongly hybridized electronic structure of YbAl2: An angle-resolved photoemission study

et al. 2013

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We report the electronic structure of a prototypical valence fluctuation system, YbAl2, using angle-resolved photoemission spectroscopy. The observed band dispersions and Fermi surfaces are well described in terms of band structure calculations based on local density approximation. Strong hybridization between the conduction and 4f bands is identified on the basis of the periodic Anderson model. The evaluated small mass enhancement factor and the high Kondo temperature qualitatively agree with those obtained from thermodynamic measurements. Such findings suggest that the strong hybridization suppresses band renormalization and is responsible for the valence fluctuations in YbAl2.

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Electronic structure of correlated electron materials from photoemission in high-quality single crystals

Cited by 15 publications

References 65 publications

Exact ground states of the periodic Anderson model inD=3dimensions

Exact ground states of the periodic Anderson model inD=3dimensions

Angle-resolved photoemission study ofUSb2: The5fband structure

Strongly hybridized electronic structure of YbAl2: An angle-resolved photoemission study

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