Etude structurale du bromure de tétraméthyltétrathiafulvalène, (TMTTF)<sub>2</sub>Br

Galigné, J. L.; Liautard, B.; Peytavin, S.; Brun, G.; Fabre, Jean‐Marc; Torreilles, E.; Giral, L.

doi:10.1107/s0567740878003635

Cited by 52 publications

(14 citation statements)

References 4 publications

(8 reference statements)

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“…The resulting crystal structure and lattice parameters of (TMTTF) 2 I at room temperature were consistent with those given in the previous report. 64 The temperature dependence of the lattice parameters and intermolecular interactions are discussed in a later section.…”

Section: Methodsmentioning

confidence: 99%

Structural investigation of the spin-singlet phase in (TMTTF)2I

et al. 2011

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To elucidate the electronic state that exists in the boundary region between the spin-singlet phase and the high-pressure side antiferromagnetic phase in the modified generalized phase diagram, we carried out x-ray diffraction, electron spin resonance, and nuclear magnetic resonance measurements of the tetramethyl-tetrathiafulvalene (TMTTF) family salt, (TMTTF) 2 I. The unit-cell volume of (TMTTF) 2 I is between that of (TMTTF) 2 Br and (TMTTF) 2 PF 6 . We found that (TMTTF) 2 I undergoes a spin-singlet phase transition at 21 K without involving paramagnetic charge-ordering phase. Therefore, the charge-ordering transition is not necessary for the spin-singlet transition of TMTTF salts as seen in other conventional spin-singlet salts. Finally, we discuss possible mechanisms of the spin-singlet phase transition.

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Section: Methodsmentioning

confidence: 99%

Structural investigation of the spin-singlet phase in (TMTTF)2I

et al. 2011

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“…Furthermore, we used a norm-conserving PBE GGA functional for all atom types, up to a certain level taking into account the exchange correlation as well as the spatial variation of the charge density. The room-temperature crystal structure for the calculations were taken for (TMTTF) 2 PF 6 and (TMTTF) 2 AsF 6 , while for (TMTTF) 2 SbF 6 we performed x-ray scattering from T = 300 K down to 100 K [13,14,82]; the structures were not relaxed within the calculations. Due to the stoichiometry of the organic salts, they are treated as metals.…”

Section: Discussionmentioning

confidence: 99%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim¹,

Dressel²

2017

Preprint

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Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

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“…Even if the reason for the stability of a metallic state in TMTSF-TCNQ above the pressure of 9 kbar is not fully established at the moment emphasizing the role of the donor stack (TMTSF) has been a strong motivation for the synthesis of new organic conductors with structures even simpler than those of two stacks charge transfer compounds. Fortunately, the Montpellier group [44] had synthesized in 1978 a series of isomorphous radical cationic conductors based on TMTTF (the sulfur analog of the TMTSF molecule) with an inorganic anion namely, (TMTTF) 2 X . These materials were all insulating at ambient pressure although some of them did reveal superconductivity under pressure much later and became quite important for studying the physics of 1D conductors since it is the replacement of TMTTF by TMTSF in the stoichiometric (TM) 2 X salt which opened the door to organic superconductivity [45].…”

Section: The Charge Transfer Period First Organic Conductorsmentioning

confidence: 99%

Organic Superconductors: When Correlations and Magnetism Walk in

Jérôme

2012

J Supercond Nov Magn

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This survey provides a brief account for the start of organic superconductivity motivated by the quest for high T c superconductors and its development since the eighties'. Besides superconductivity found in 1D organics in 1980, progresses in this field of research have contributed to better understand the physics of low dimensional conductors highlighted by the wealth of new remarkable properties. Correlations conspire to govern the low temperature properties of the metallic phase. The contribution of antiferromagnetic fluctuations to the interchain Cooper pairing proposed by the theory is borne out by experimental investigations and supports supercondutivity emerging from a non Fermi liquid background. Quasi one dimensional organic superconductors can therefore be considered as simple prototype systems for the more complex high T c materials.

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Etude structurale du bromure de tétraméthyltétrathiafulvalène, (TMTTF)₂Br

Cited by 52 publications

References 4 publications

Structural investigation of the spin-singlet phase in (TMTTF)2I

Structural investigation of the spin-singlet phase in (TMTTF)2I

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Organic Superconductors: When Correlations and Magnetism Walk in

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Etude structurale du bromure de tétraméthyltétrathiafulvalène, (TMTTF)2Br

Cited by 52 publications

References 4 publications

Structural investigation of the spin-singlet phase in (TMTTF)2I

Structural investigation of the spin-singlet phase in (TMTTF)2I

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Organic Superconductors: When Correlations and Magnetism Walk in

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Etude structurale du bromure de tétraméthyltétrathiafulvalène, (TMTTF)₂Br