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Анисимов, В. И.; Некрасов, И. А.; Kondakov, D.E.; Rice, T. M.; Sigrist, Manfred

doi:10.1007/s10051-002-8912-5

Cited by 221 publications

(348 citation statements)

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“…Thus, the present three-band system does not exhibit orbital selective Mott transitions. Our solution solely relies on the structure induced increase in d xy occupancy [14] and is consistent with the (n xy , n xz , n yz ) = (1.0, 0.5, 0.5) configuration obtained for Ca 2 RuO 4 within LDA+U [8]. Thus, we do not require the more complex path n xy ≈ 2/3 → 1/2 → 1 as Sr is replaced by Ca.…”

supporting

confidence: 82%

“…Accordingly, in contrast to Ref. [8], d xy is the first band to become insulating with increasing U . An important parameter in this work is the crystal field splitting ∆ between t 2g orbitals, which yields Mott transitions at much smaller values of U than for ∆ = 0.…”

contrasting

confidence: 72%

“…[8,12]: Instead of successive transitions in the half-filled d xy band and in the 3/4-filled d xz,yz bands, we find a common d xy band filling and d xz,yz Mott transition. The d xy band filling, induced by the combined effect of crystal field and Coulomb interactions, signifies a change from a correlated metallic state to a correlated band insulating state and does not correspond to a Mott transition.…”

mentioning

confidence: 85%

“…An important parameter in this work is the crystal field splitting ∆ between t 2g orbitals, which yields Mott transitions at much smaller values of U than for ∆ = 0. In both models, a second interorbital charge transfer due to additional structural modifications, i.e., (n xy , n xz , n yz ) = (0.5, 0.75, 0.75) → (1.0, 0.5, 0.5), is required in the limit x → 0 to yield the antiferromagnetic insulating properties of Ca 2 RuO 4 [8].…”

mentioning

confidence: 99%

“…2, whereas they are difficult to reconcile with the trend towards half-filled d xy bands proposed in Refs. [8,12].…”

mentioning

confidence: 99%

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Subband Filling and Mott Transition inCa2−xSrxRuO4

2007

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A new concept is proposed for the paramagnetic metal insulator transition in the layer perovskite Ca2−xSrxRuO4. Whereas the pure Sr compound is metallic up to very large Coulomb energies due to strong orbital fluctuations, structural changes induced by doping with Ca give rise to a interorbital charge transfer which makes the material extremely sensitive to local correlations. Using dynamical mean field theory based on finite temperature multi-band exact diagonalization it is shown that the combination of crystal field splitting and onsite Coulomb interactions leads to complete filling of the dxy band and to a Mott transition in the half-filled dxz,yz bands.DOI:

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supporting

confidence: 82%

contrasting

confidence: 72%

mentioning

confidence: 85%

mentioning

confidence: 99%

“…2, whereas they are difficult to reconcile with the trend towards half-filled d xy bands proposed in Refs. [8,12].…”

mentioning

confidence: 99%

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Subband Filling and Mott Transition inCa2−xSrxRuO4

2007

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Orbital Physics in Transition Metal Oxides: Magnetism and Optics

Horsch¹

2007

Handbook of Magnetism and Advanced Magnetic Materials

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Orbital degeneracy and strong correlations in transition‐metal oxides generate spins and orbitals as low‐energy degrees of freedom. Their interplay with both real‐charge motion and virtual‐charge excitations lead to a fascinating richness of spin–charge–orbital‐ordered phases in transition‐metal oxides, to striking phenomena like the colossal magnetoresistance in manganites, the switching of charge‐ordered phases into metallic phases by applied magnetic field, and many other fascinating effects. Central topics of this review are the spin‐orbital superexchange models which provide a concise description of spin and orbital order, effective spin interactions, spin waves, and orbiton excitations in doped and undoped Mott insulators. Particular emphasis is put on recent developments of spin‐orbital superexchange models, the relation of magnetism and optical spectral weights and their temperature dependence, t 2g systems with strong composite spin‐orbital fluctuations, the concepts of orbital liquid, orbital polarons, and the colossal magnetoresistance.

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Spectroscopic Studies on the Metal–Insulator Transition Mechanism in Correlated Materials

et al. 2018

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The metal-insulator transition (MIT) in correlated materials is a novel phenomenon that accompanies a large change in resistivity, often many orders of magnitude. It is important in its own right but its switching behavior in resistivity can be useful for device applications. From the material physics point of view, the starting point of the research on the MIT should be to understand the microscopic mechanism. Here, an overview of recent efforts to unravel the microscopic mechanisms for various types of MITs in correlated materials is provided. Research has focused on transition metal oxides (TMOs), but transition metal chalcogenides have also been studied. Along the way, a new class of MIT materials is discovered, the so-called relativistic Mott insulators in 5d TMOs. Distortions in the MO (M = transition metal) octahedron are found to have a large and peculiar effect on the band structure in an orbital dependent way, possibly paving a way to the orbital selective Mott transition. In the final section, the character of the materials suitable for applications is summarized, followed by a brief discussion of some of the efforts to control MITs in correlated materials, including a dynamical approach using light.

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Cited by 221 publications

References 0 publications

Subband Filling and Mott Transition inCa2−xSrxRuO4

Subband Filling and Mott Transition inCa2−xSrxRuO4

Orbital Physics in Transition Metal Oxides: Magnetism and Optics

Spectroscopic Studies on the Metal–Insulator Transition Mechanism in Correlated Materials

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