Crystallographic structures of (TMTSF)2 PF6 under constraint: evidence of a change in the electronic structure

Gallois, B.; Gaultier, J.; Lamcharfi, T.; Bechtel, Françoise; Filhol, A.; Ducasse, Laurent; Abderrabba, Manef

doi:10.1016/0379-6779(87)90374-2

Cited by 15 publications

(13 citation statements)

References 10 publications

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“…1. The values reported for (TMTSF) 2 PF 6 are in reasonable agreement with previous structural studies under moderate pressure [12,13]. Upon increasing the pressure further, the unit-cell parameters experience an abrupt jump indicating a pressure-induced structural phase transition.…”

Section: Resultssupporting

confidence: 90%

“…However, the compressibility and structure at high pressures of the Bechgaard-Fabre salts has not been measured up to the present day. To the best of our knowledge, the highest pressure at which the structure has been determined is 1.6 GPa for the example of (TMTSF) 2 PF 6 -the first organic superconductor [12,13]. On the other hand, high-pressure dc transport of (TMTTF) 2 PF 6 has been investigated at pressures up to 8 GPa [9], much higher than any structural study of the Bechgaard-Fabre salts reported up to now.…”

Section: Introductionmentioning

confidence: 99%

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Pressure-induced structural phase transition in the Bechgaard-Fabre salts

et al. 2009

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Pressure-induced structural phase transition in the Bechgaard-Fabre salts

et al. 2009

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“…13,46 Therefore, the constant-volume temperature dependence of the resistivity does not deviate from the quadratic law observed under constant ambient pressure. In general, the constant-pressure to constant-volume corrections has the consequence that the temperature behavior of the dc resistivity yields reduced power laws, as can be seen from Fig.…”

Section: Resistivitymentioning

confidence: 99%

“…At low temperature, T < 50 K, both the thermal expansion and the pressure coefficient are small [13,46]. Therefore, the constant-volume temperature dependence of the resistivity does not deviate from the quadratic law observed under constant ambient pressure.…”

Section: Resistivitymentioning

confidence: 99%

Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

et al. 2005

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We report on dc and microwave experiments of the low-dimensional organic conductors ͑TMTSF͒ 2 PF 6 and ͑TMTSF͒ 2 ClO 4 along the a, bЈ, and c * directions. In the normal state of ͑TMTSF͒ 2 PF 6 below T = 70 K, the dc resistivity follows a power law with a and b Ј proportional to T 2 while c * ϰ T. Above T = 100 K the exponents extracted from the data for the a and c * axes are consistent with what is to be expected for a system of coupled one-dimensional chains ͑Luttinger liquid͒ and a dimensional crossover at a temperature of about 100 K. The bЈ axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The contactless microwave measurements of single crystals along the bЈ axis reveal an anomaly between 25 and 55 K which is not understood yet. The organic superconductor ͑TMTSF͒ 2 ClO 4 is more a two-dimensional metal with an anisotropy a / b Ј of approximately 2 at all temperatures. Such a low anisotropy is unexpected in view of the transfer integrals. Slight indications to one-dimensionality are found in the temperature dependent transport only above 200 K. Even along the least conducting c * direction no region with semiconducting behavior is revealed up to room temperature.

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“…The slight monotonic increase of the spectral weight (about 5% from the lowest to the highest pressure) can be attributed to the increase of the charge density due to the pressure-induced lattice compression. 35 Based on the spectral weight, we estimated the band mass m a of (TMTTF) 2 AsF 6 for the lowest pressure: with a charge density of N = 1.5 × 10 21 cm −3 , as calculated from the lattice parameters, 36 we obtain a band mass m a ≈ 1.8m e (m e being the free electron mass) according to Eq. ( 5).…”

Section: A Longitudinal Optical Responsementioning

confidence: 99%

Pressure-induced deconfinement of the charge transport in the quasi-one-dimensional Mott insulator(TMTTF)2AsF6

2006

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We studied the pressure dependence of the room-temperature infrared reflectivity of (TMTTF)2AsF6 along all three optical axes. This anisotropic organic compound consists of molecular stacks with orbital overlap along the a direction; due to electronic correlations the system is a quasi-one-dimensional Mott insulator with a charge gap ∆ρ ≈ 70 meV. The gap is gradually reduced with increasing external pressure, accompanied by the onset of a Drude contribution along the stacking direction. In the perpendicular b ′ direction a Drude-like optical response is observed for pressures above 2 GPa. This behavior is interpreted in terms of a deconfinement of the electrons in a one-dimensional Mott insulator, i.e. an insulator-to-metal transition which occurs when the interchain transfer integral t b is approximately equal to half of the charge gap energy. We estimate the values of t b and the Luttinger liquid parameter Kρ as a function of pressure.

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Crystallographic structures of (TMTSF)2 PF6 under constraint: evidence of a change in the electronic structure

Cited by 15 publications

References 10 publications

Pressure-induced structural phase transition in the Bechgaard-Fabre salts

Pressure-induced structural phase transition in the Bechgaard-Fabre salts

Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

Pressure-induced deconfinement of the charge transport in the quasi-one-dimensional Mott insulator(TMTTF)2AsF6

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