Electron-Electron Umklapp Scattering in Organic Superconductors

Emery, V. J.; Bruinsma, Robijn; Barišić, S.

doi:10.1103/physrevlett.48.1039

Cited by 288 publications

(182 citation statements)

References 12 publications

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“…It is commonly attributed to a dimerization of the T MT T F stacks that results in a half-filled anti-bonding band [1]. A Mott-Hubbard gap results, without additional symmetry breaking, once electronic correlations are included.…”

Section: Introductionmentioning

confidence: 99%

Influence of charge order on the ground states of TMTTF molecular salts

Zámborszky

Alavi

et al. 2004

J. Phys. IV France

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Abstract. (T M T T F ) 2 AsF 6 and (T M T T F ) 2 SbF 6 are both known to undergo a charge ordering phase transition, though their ground states are different. The ground state of the first is Spin-Peierls, and the second is an antiferromagnet. We study the effect of pressure on the ground states and the charge-ordering using 13 C NMR spectroscopy. The experiments demonstrate that the the CO and SP order parameters are repulsive, and consequently the AF state is stabilized when the CO order parameter is large, as it is for (T M T T F ) 2 SbF 6 . An extension of the well-known temperature/pressure phase diagram is proposed.

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Section: Introductionmentioning

confidence: 99%

Influence of charge order on the ground states of TMTTF molecular salts

Zámborszky

Alavi

et al. 2004

J. Phys. IV France

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“…Near to the SP ground state is a high- symmetry phase with a charge gap (∆ ρ ), whereas near to the SC ground state is a highly conducting normal state. Emery, et al [15] were the first to point out a simple mechanism by which this crossover from insulating to metallic behavior could occur without crossing a phase boundary, and their proposal led to the composite phase diagram. The compounds are formed by stacking the planar TMTTF molecules, and then lining up the stacks into layers that are separated by layers of counterions.…”

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confidence: 99%

Charge Ordering in the TMTTF Family of Molecular Conductors

et al. 2000

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Using one-and two-dimensional NMR spectroscopy applied to 13 C spin-labeled (TMTTF)2AsF6 and (TMTTF)2PF6, we demonstrate the existence of an intermediate charge-ordered phase in the TMTTF family of charge-transfer salts. At ambient temperature, the spectra are characteristic of nuclei in equivalent environments, or molecules. Below a continuous charge-ordering transition temperature Tco, the spectra are explained by assuming there are two inequivalent molecules with unequal electron densities. The absence of an associated magnetic anomaly indicates only the charge degrees of freedom are involved and the lack of evidence for a structural anomaly suggests that charge/lattice coupling is too weak to drive the transition.

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“…The metal to insulator 'transition' occurs at a characteristic temperature usually denoted as T ρ ∼ 10 2 K (Figure 1), below which electrical transport develops a thermally activated behavior [18]. Since spin degrees of freedom remain unaffected at T ρ − as shown by the absence of anomaly in the spin susceptibility at that temperature [6] − (TMTTF) 2 X are good examples of Mott insulators below T ρ [19]. The measured amplitude of the Mott insulating gap ∆ ρ ∼ 3T ρ even exceeds the transverse bare hopping amplitude t ⊥ obtained from band calculations [20].…”

Section: B the Sulfur Series And The Mott Insulating Picturementioning

confidence: 99%