Optical properties of low-dimensional cuprates

Moskvin, A. S.

doi:10.1016/j.optmat.2019.02.033

Cited by 2 publications

(5 citation statements)

References 38 publications

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“…Strictly speaking, reliable identification of the intra-center p-d CT transitions is possible only in highly dilute or impurity systems, such as YAlO 3 :Fe or Ca 3 Fe x Ga 2−x Ge 3 O 12 , whereas in concentrated systems (YFeO 3 , Ca 3 Fe 2 Ge 3 O 12 , Y 3 Fe 5 O 12 , etc. ), these transitions compete with inter-center d-d CT transitions [41][42][43]45,47,48].…”

Section: Inter-center D-d Ct Transitionsmentioning

confidence: 99%

“…It is now believed that the most intensive low-energy electron-hole excitations in insulating 3d oxides correspond to the charge transfer (CT) transitions [7,8,[31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. Namely, the CT transitions are considered as a likely source of the optical and magneto-optical response of the 3d metal-based oxide compounds, in particular, ferrites, in a wide spectral range of 1-10 eV, primarily of the fundamental absorption edge.…”

Section: Cluster Model Approachmentioning

confidence: 99%

“…These have a long and distinguished history of applications in electron, optical and magnetooptical spectroscopy, magnetism and magnetic resonance. The author and his colleagues has successfully demonstrated the great potential of the cluster model for description of the p-d and d-d charge transfer transitions and their contributions to optical and magnetooptical responses of various 3d oxides, such as ferrites [31][32][33][34][35][36][37][38][39][40], cuprates [41][42][43][44][45], manganites [40,46,47] and nickelates [48,49]. Five Me 3d and eighteen oxygen O 2p atomic orbitals in the octahedral MeO 6 complex with the point symmetry group O h form hybrid Me 3d-O 2p bonding and antibonding e g and t 2g molecular orbitals, and purely oxygen nonbonding a 1g (σ), t 1g (π), t 1u (σ), t 1u (π) and t 2u (π) orbitals (see, e.g., [5,8,29,46]).…”

Section: Cluster Model Approachmentioning

confidence: 99%

“…The inter-center d-d CT transitions between two MeO n clusters centered at neighboring sites 1 and 2 define inter-center d-d CT excitons in 3d oxides [41][42][43]45,47,48]. These excitons may be addressed as quanta of the disproportionation reaction…”

Section: Inter-center D-d Ct Transitionsmentioning

confidence: 99%

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Charge Transfer Transitions and Circular Magnetooptics in Ferrites

Moskvin

2022

Magnetochemistry

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The concept of charge transfer (CT) transitions in ferrites is based on the cluster approach and takes into account the relevant interactions, such as the low-symmetry crystal field, spin–orbital, Zeeman, exchange and exchange-relativistic interactions. For all its simplicity, this concept yields a reliable qualitative and quantitative microscopic explanation of spectral, concentration, temperature and field dependencies of optic and magneto-optic properties ranging from the isotropic absorption and optical anisotropy to circular magneto-optics. In this review paper, starting with a critical analysis of the fundamental shortcomings of the “first-principles” density functional theory (DFT-based) band theory, we present the main ideas and techniques of the cluster theory of the CT transitions to be main contributors to circular magneto-optics of ferrites. Numerous examples of comparison of cluster theory with experimental data for orthoferrites, iron garnets and other ferrites are given.

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Section: Inter-center D-d Ct Transitionsmentioning

confidence: 99%

Section: Cluster Model Approachmentioning

confidence: 99%

Section: Cluster Model Approachmentioning

confidence: 99%

Section: Inter-center D-d Ct Transitionsmentioning

confidence: 99%

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Charge Transfer Transitions and Circular Magnetooptics in Ferrites

Moskvin

2022

Magnetochemistry

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“…Детальный анализ оптических и EELS (electron energy loss spectra) спектров различных купратов [21][22][23][24][25]…”

Section: D-d-экситоны с переносом заряда и их эволюция в родительских...unclassified

Экситоны С Переносом Заряда В ВТСП Купратах И Никелатах

Москвин¹

2023

Оптика И Спектроскопия

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An analysis of the optical properties of compounds based on 3d elements provides valuable information about the electronic structure of the ground state and low-energy excitations. Thus, we show that the analysis of charge-transfer d-d excitons in the dielectric antiferromagnetic phase of cuprates and metastable low-energy electron-hole EH dimers being a result of their evolution after electron-lattice relaxation, turns out to be very fruitful not only for describing linear and nonlinear optical properties and photoinduced effects, but also to develop a promising model of charge triplets to describe the low-energy electronic structure and T-x phase diagrams of active CuO2 planes in cuprates of the T-La2CuO4 or T’-Nd2CuO4 type, as well as NiO2 planes in nickelates of the RNiO2 type, and their evolution with changes in the main energy parameters.

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Optical properties of low-dimensional cuprates

Cited by 2 publications

References 38 publications

Charge Transfer Transitions and Circular Magnetooptics in Ferrites

Charge Transfer Transitions and Circular Magnetooptics in Ferrites

Экситоны С Переносом Заряда В ВТСП Купратах И Никелатах

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