Disentangling the conductivity spectra of two-dimensional organic conductors

Dressel, Martin; Faltermeier, D.; Dumm, M.; Drichko, Natalia; Петров, Б. И.; Semkin, V. N.; Vlasova, R. M.; Meźière, Cécile; Batail, Patrick

doi:10.1016/j.physb.2008.11.051

Cited by 18 publications

(15 citation statements)

References 19 publications

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“…It is also suggested that in addition to these features, the electronic excitation due to CT within dimers should be explicitly included in the discussion of optical spectra of strongly dimerized systems. For example, in the κ‐phase organic conductors an additional band due to CT appears in the mid‐infrared range together with the Hubbard band, as exemplified by both the experimental,61–63 and recent theoretical studies 64…”

Section: Resultsmentioning

confidence: 79%

“…[57][58][59][60] It is also suggested that in addition to these features, the electronic excitation due to CT within dimers should be explicitly included in the discussion of optical spectra of strongly dimerized systems. For example, in the k-phase organic conductors an additional band due to CT appears in the mid-infrared range together with the Hubbard band, as exemplified by both the experimental, [61][62][63] and recent theoretical studies. [64] To disentangle different contributions and extract the electronic structure parameters we use a Drude-Lorentz (D-L) dielectric function [65] with one Lorentz oscillator for the summarized electronic interband excitations including possible "Hubbard-like" and intradimer CT bands [Eq.…”

Section: Electronic Responsementioning

confidence: 99%

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Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts

et al. 2013

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The polarized infrared reflectance and Raman spectra of the three quasi-two-dimensional β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅Y bifunctional charge-transfer salts, where BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene and Y = C6H5Br, (C6H5CN)0.17(C6H5Br)0.83, (C6H5CN)0.4(C6H5F)0.6, have been measured as a function of the temperature. Signatures of charge inhomogenity have been found in both Raman and infrared spectra of the β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅Y superconductors. A 100 K transition to a mixed insulating/metallic state is clearly seen for the first time in the temperature dependence of the electronic spectra of superconducting β''-(BEDT-TTF)4[(H3O)Fe(C2O4)3]⋅C6H5Br. We suggest that this phase transition is due to subtle changes in the ethylene groups ordering, which are related to a structural phase transition in the anionic layer. The infrared and Raman spectra of quasi-two-dimensional metal α-'pseudo-κ'-(BEDT-TTF)4[(H3O)Fe(C2O4)3]C6H4Br2 are also investigated.

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Section: Resultsmentioning

confidence: 79%

Section: Electronic Responsementioning

confidence: 99%

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts

et al. 2013

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“…The smooth crossover from coherent Fermi-liquid to more incoherent excitations leads to a non-monotonic T -dependence not only in the electrical resistance, but also in thermopower and Hall coefficient. x yield the charge and spin dynamics as the metallic state evolves, when moving across the phase boundary or reducing the temperature [343,392,[397][398][399]. As shown in Figure 52(a), the pristine and weakly substituted compounds behave strongly isulating; but for x = 0.4 metallic fluctuations become obvious at low temperatures.…”

Section: Coherent Transportmentioning

confidence: 99%

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Dressel

Tomić

2020

Advances in Physics

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This review provides a perspective on recent developments and their implications for our understanding of novel quantum phenomena in the physics of two-dimensional organic solids. We concentrate on the phase transitions and collective response in the charge sector, the importance of coupling of electronic and lattice degrees of freedom and stress an intriguing role of disorder. After a brief introduction to low-dimensional organic solids and their crystallographic structures, we focus on the dimensionality and interactions and emergent quantum phenomena. Important topics of current research in organic matter with sizeable electronic correlations are Mott metal-insulator phase transitions, charge order and ferroelectricity. Highly frustrated two-dimensional systems are established model compounds for studying the quantum spin liquid state and the competition with magnetic long-range order. There are also unique examples of quantum disordered state of magnetic and electric dipoles. Representative experimental results are complemented by current theoretical approaches.

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“…Among the two-dimensional organic CT salts, the κ-phase ET salts are of particular interest, because the constituting cationic dimers are arranged in an anisotropic lattice [53][54][55]. To understand the electronic properties of such group of organic conductors Kino and Fukuyama [56][57][58] considered a triangular lattice.…”

Section: Electronic Structure Investigated By Optical Spectroscopymentioning

confidence: 99%

Vibrational and Electronic Structure, Electron-Electron and Electron-Phonon Interactions in Organic Conductors Investigated by Optical Spectroscopy

Łapiński¹

2016

Applications of Molecular Spectroscopy to Current Research in the Chemical and Biological Sciences

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The physical properties of organic conductors formed by tetrathiafulvalene (TTF) derivatives have been discussed in this chapter. The results were obtained using spectroscopic methods including infrared (IR), Raman, and UV-Vis. The experimental data were supported by theoretical DFT and TD-DFT calculations. Special attention has been paid to the description of electronic and vibrational structures, electron-electron and electron-phonon interactions and determination of transport parameters.

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Disentangling the conductivity spectra of two-dimensional organic conductors

Cited by 18 publications

References 19 publications

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Vibrational and Electronic Structure, Electron-Electron and Electron-Phonon Interactions in Organic Conductors Investigated by Optical Spectroscopy

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Disentangling the conductivity spectra of two-dimensional organic conductors

Cited by 18 publications

References 19 publications

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)4[(H3O)Fe(C2O4)3]⋅Y Molecular Charge‐Transfer Salts

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)4[(H3O)Fe(C2O4)3]⋅Y Molecular Charge‐Transfer Salts

Molecular quantum materials: electronic phases and charge dynamics in two-dimensional organic solids

Vibrational and Electronic Structure, Electron-Electron and Electron-Phonon Interactions in Organic Conductors Investigated by Optical Spectroscopy

Contact Info

Product

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Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts

Charge Fluctuations and Ethylene‐Group‐Ordering Transition in β′′‐(BEDT‐TTF)₄[(H₃O)Fe(C₂O₄)₃]⋅Y Molecular Charge‐Transfer Salts