Density-of-States Spectra for the fcc Lattice with Variable Second-Neighbor Interactions

Loly, P. D.; Buchheit, M.

doi:10.1103/physrevb.5.1986

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…continuous MIT without change of magnetic order. This can be interpreted as follows: at large absolute values of t ′ the electron spectrum of fcc lattice tends to the the spectrum of sc lattice [36], and this tendency results in a similar magnetic state with Q = (π, π, π) and similar scenario of MIT. According to this analogy one may expect the (π, π, π) metal region at large positive values of t ′ /t, but magnetism in this region is possible only at very high U values where existence of the gapless magnetic state is impossible.…”

Section: Results: Metal-insulator Transitionmentioning

confidence: 91%

Magnetic states, correlation effects and metal-insulator transition in FCC lattice

Timirgazin¹,

Igoshev²,

Аржников³

et al. 2016

J. Phys.: Condens. Matter

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The ground-state magnetic phase diagram (including collinear and spiral states) of the single-band Hubbard model for the face-centered cubic lattice and related metal-insulator transition (MIT) are investigated within the slave-boson approach by Kotliar and Ruckenstein. The correlation-induced electron spectrum narrowing and a comparison with a generalized Hartree-Fock approximation allow one to estimate the strength of correlation effects. This, as well as the MIT scenario, depends dramatically on the ratio of the next-nearest and nearest electron hopping integrals [Formula: see text]. In contrast with metallic state, possessing substantial band narrowing, insulator one is only weakly correlated. The magnetic (Slater) scenario of MIT is found to be superior over the Mott one. Unlike simple and body-centered cubic lattices, MIT is the first order transition (discontinuous) for most [Formula: see text]. The insulator state is type-II or type-III antiferromagnet, and the metallic state is spin-spiral, collinear antiferromagnet or paramagnet depending on [Formula: see text]. The picture of magnetic ordering is compared with that in the standard localized-electron (Heisenberg) model.

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Section: Results: Metal-insulator Transitionmentioning

confidence: 91%

Magnetic states, correlation effects and metal-insulator transition in FCC lattice

Timirgazin¹,

Igoshev²,

Аржников³

et al. 2016

J. Phys.: Condens. Matter

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“…The bubble diagram has been treated perturbatively. The spectral function has been evaluated using Eq (15)…”

mentioning

confidence: 99%

One-Phonon Spectral Function for Solid Helium

McMahan

Beck

1973

Phys. Rev. A

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Approximate numerical calculations are used in order to understand some of the differences in size and shape of secondary structure obtained in calculations of the one-phonon spectral function for solid helium which have been reported in the literature. It is seen that Horner's self-consistent treatment of the bubble diagram significantly increases the size of such structure over that obtained in perturbative calculations such as used by Glyde and co-workers. A computational procedure used by Horner in evaluating the spectral function may also further enhance the appearance of secondary peaks in the tail region. Previous explanations of these secondary peaks are reviewed and criticised. Other calculations of the onephonon spectral functions for the solid heliums are briefly discussed.

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A diatomic network model for electronic states of bulk, surface and thin films

Lee

1985

Journal of Physics and Chemistry of Solids

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Density-of-States Spectra for the fcc Lattice with Variable Second-Neighbor Interactions

Cited by 9 publications

References 12 publications

Magnetic states, correlation effects and metal-insulator transition in FCC lattice

Magnetic states, correlation effects and metal-insulator transition in FCC lattice

One-Phonon Spectral Function for Solid Helium

A diatomic network model for electronic states of bulk, surface and thin films

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