<sup>13</sup>C NMR studies of TTF (<sup>13</sup>C)-TCNQ

Takahashi, Tomoko; Jérôme, D.; Masin, Francis; Fabre, J.M.; Giral, L.

doi:10.1088/0022-3719/17/21/011

Cited by 46 publications

(21 citation statements)

References 27 publications

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“…Deviating behavior of both chains has also been observed in studies of the 13 C NMR Knight shift which reveal pronounced differences in the magnitude and temperature dependence of the local TTF-and TCNQ-derived magnetic susceptibilities. 49 This has been interpreted as indication of enhanced non-local Coulomb interaction on the TTF chains, consistent with the observation of 4k F fluctuations 8,50 and an effective reduction of spinon-holon splitting. Furthermore, it is not clear which additional effect on the ARPES spectra may arise from the fluctuations themselves; they could for example account for the relatively large linewidth of the experimental TTF peak ͓see structure ͑c͒ in Fig.…”

Section: Comparison To the 1d Hubbard Modelsupporting

confidence: 79%

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

et al. 2003

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We study the electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ by means of density-functional band theory, Hubbard model calculations, and angle-resolved photoelectron spectroscopy ͑ARPES͒. The experimental spectra reveal significant quantitative and qualitative discrepancies to band theory. We demonstrate that the dispersive behavior as well as the temperature dependence of the spectra can be consistently explained by the finite-energy physics of the one-dimensional Hubbard model at metallic doping. The model description can even be made quantitative, if one accounts for an enhanced hopping integral at the surface, most likely caused by a relaxation of the topmost molecular layer. Within this interpretation the ARPES data provide spectroscopic evidence for the existence of spin-charge separation on an energy scale of the conduction bandwidth. The failure of the one-dimensional Hubbard model for the low-energy spectral behavior is attributed to interchain coupling and the additional effect of electron-phonon interaction.

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Section: Comparison To the 1d Hubbard Modelsupporting

confidence: 79%

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

et al. 2003

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“…The 2k F CDW order involves electron-phonon coupling, as is known from the Kohn anomaly observed by neutron scattering [14]. This clarifies the specific role of TTF and TCNQ derived electronic states as a function of momentum and temperature compared with earlier work [11,12,14,15,27].…”

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confidence: 69%

Temperature-Dependent Luttinger Surfaces

et al. 2005

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The Luttinger surface of an organic metal (TTF-TCNQ), possessing charge order and spin-charge separated band dispersions, is investigated using temperature-dependent angle-resolved photoemission spectroscopy. The Luttinger surface topology, obtained from momentum distribution curves, changes from quasi-2D (dimensional) to quasi-1D with temperature. The high temperature quasi-2D surface exhibits 4kF charge-density-wave (CDW) superstructure in the TCNQ derived holon band, in the absence of 2kF order. Decreasing temperature results in quasi-1D nested 2kF CDW order in the TCNQ spinon band and in the TTF surface. The results establish the link in momentum space between charge order and spin-charge separation in a Luttinger liquid.

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“…However, the ARPES data give no evidence for such a gap within experimental resolution, leading to an estimate of U/t < 0.2(0.4) for the surface (volume) and hence implying only weak coupling. While this result would be consistent with the temperature-independent (i.e., Pauli-like) spin susceptibility determined for the TTF chains [7], it seems to be at variance with the observation of 4k F charge density fluctuations localized on the TTF stacks [5,8]. The latter has traditionally been interpreted as signature of strong long-range Coulomb interaction [8].…”

Section: Resultssupporting

confidence: 82%

Signatures of spin-charge separation in the 1D organic conductor TTF-TCNQ from photoelectron spectroscopy

et al. 2004

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We have studied the electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ by angle-resolved photoelectron spectroscopy (ARPES). The data reveal significant discrepancies to conventional band theory. Instead the experimental dispersions can be quantitatively reproduced by the one-dimensional (1D) Hubbard model, if one allows for a surface-enhancement of the hopping integral induced by a relaxation of the tomost molecular layer. The TCNQ-related conduction band is thus found to display spectroscopic signatures of spin-charge separation on the energy scale of the band width. In contrast, the TTF-derived band seems to be only weakly correlated, at variance with other findings. The important role of electronic correlations in this material is further corrborated by a peculiar temperature dependence of the spectra. While the 1D Hubbard model thus yields a good description at finite excitation energies, it fails concerning the low-energy spectral behavior, most likely due to the additional importance of strong electron-phonon interaction and interchain electronic hopping on small energy scales.

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¹³C NMR studies of TTF (¹³C)-TCNQ

Cited by 46 publications

References 27 publications

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Temperature-Dependent Luttinger Surfaces

Signatures of spin-charge separation in the 1D organic conductor TTF-TCNQ from photoelectron spectroscopy

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13C NMR studies of TTF (13C)-TCNQ

Cited by 46 publications

References 27 publications

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Electronic structure of the quasi-one-dimensional organic conductor TTF-TCNQ

Temperature-Dependent Luttinger Surfaces

Signatures of spin-charge separation in the 1D organic conductor TTF-TCNQ from photoelectron spectroscopy

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¹³C NMR studies of TTF (¹³C)-TCNQ