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Kuwamoto, H.; Honig, J. M.; Appel, J.

doi:10.1103/physrevb.22.2626

Cited by 192 publications

(97 citation statements)

References 55 publications

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“…This crossover is characterized by a sudden increase in ρ dc as function of U at a fix T (inset Fig.5). This crossover behavior was experimentally observed in V 2 O 3 by Kuwamoto et al 33 . …”

Section: A Hubbard Modelmentioning

confidence: 62%

Transfer of spectral weight in spectroscopies of correlated electron systems

1996

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We study the transfer of spectral weight in the photoemission and optical spectra of strongly correlated electron systems. Within the LISA, that becomes exact in the limit of large lattice coordination, we consider and compare two models of correlated electrons, the Hubbard model and the periodic Anderson model. The results are discussed in regard of recent experiments. In the Hubbard model, we predict an anomalous enhancement optical spectral weight as a function of temperature in the correlated metallic state which is in qualitative agreement with optical measurements in V2O3. We argue that anomalies observed in the spectroscopy of the metal are connected to the proximity to a crossover region in the phase diagram of the model. In the insulating phase, we obtain an excellent agreement with the experimental data and present a detailed discussion on the role of magnetic frustration by studying the k−resolved single particle spectra. The results for the periodic Anderson model are discussed in connection to recent experimental data of the Kondo insulators Ce3Bi4P t3 and F eSi. The model can successfully explain the different energy scales that are associated to the thermal filling of the optical gap, which we also relate to corresponding changes in the density of states. The temperature dependence of the optical sum rule is obtained and its relevance for the interpretation of the experimental data discussed. Finally, we argue that the large scattering rate measured in Kondo insulators cannot be described by the periodic Anderson model.

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Section: A Hubbard Modelmentioning

confidence: 62%

Transfer of spectral weight in spectroscopies of correlated electron systems

1996

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“…Under growing pressure, the compound undergoes transition from the insulator state to the conductor. At present time, this phenomenon is well understood: There is general consensus that this transition belongs to universality class of the 3-dimensional Ising model, characterised by critical exponents δ ≈ 4.9, β ≈ 0.33, γ ≈ 1.25 [4]. The critical temperature is high (about 500 K), and satisfactory description of the transition within renormalisation group based on the Landau-Ginzburg-Wilson (LGW) functional has been proposed.…”

Section: Introductionmentioning

confidence: 99%

“…As a canonical example of the MIT one can mention this phenomenon in (doped) vanadium oxide V 2 O 3 [3,4]. Under growing pressure, the compound undergoes transition from the insulator state to the conductor.…”

Section: Introductionmentioning

confidence: 99%

Critical Exponents for Metal-Insulator Transition in Two-Dimensional Systems

Wojtkiewicz

2009

Acta Phys. Pol. A

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Three years ago, a new universality class, associated with the metal-insulator transition in quasi-two--dimensional compounds, was discovered. Imada has given explanation of the observed critical behaviour. Considerations in this work are based on the assumption that the one-particle dispersion is quartic one instead of the standard quadratic behaviour. In this paper, it is shown that other possible natural non-standard dispersions lead to other possible critical behaviour and critical exponents.

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“…la and 2 [3], which show the variation of the resistivity p with temperature T in a series of plots of log p vs. 1/T for M = Cr, Ti, and u (where u stands for cation vacancies generated when excess oxygen is introduced into the lattice). The measurements were carried out on single crystals grown by the skull melting technique [4], and subsequently annealed under appropriate oxygen atmospheres to control the oxygen/metal ratio.…”

Section: The V203 Alloy Systemmentioning

confidence: 99%

“…Many different answers, listed in Refs. [1][2][3], have been proposed, on the basis of a very large body of disparate experimental observations. Note also that V203 with sufficient excess oxygen or titanium substitution remains a metal down to the cryogenic temperature range.…”

Section: The V203 Alloy Systemmentioning

confidence: 99%

Electron Correlation Phenomena in Selected Transition Metal Oxides

Honig

1994

Acta Phys. Pol. A

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The theory of electron correlation phenomena is reviewed and used to interpret the transport, thermal, or magnetic properties of V203, LaNiO3 and Fe304 systems, each of which to a greater or lesser degree displays correlation effects. A rationale is provided for interpreting the various types of phase transitions encountered in the vanadium sesquioxide and magnetite host systems and to show why these are altered by small compositional variations.

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Electrical properties of the(V1−xCrx)

Cited by 192 publications

References 55 publications

Transfer of spectral weight in spectroscopies of correlated electron systems

Transfer of spectral weight in spectroscopies of correlated electron systems

Critical Exponents for Metal-Insulator Transition in Two-Dimensional Systems

Electron Correlation Phenomena in Selected Transition Metal Oxides

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