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Zámborszky, F.; Szeghy, G.; Abdussalam, G.; Forró, Lászlø; Mihály, G.

doi:10.1103/physrevb.60.4414

Cited by 10 publications

(11 citation statements)

References 19 publications

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“…The behavior agrees well with previously published data. 16,31,33,43,44 To our knowledge, there are only two reports 19,31 on dc measurements of the bЈ-axis conductivity of ͑TMTSF͒ 2 PF 6 crystals; as a matter of fact both strongly contradict each other. Our findings are in very good agreement with the recent report of Mihály et al 19 where the Montgomery method was employed.…”

Section: Resistivitymentioning

confidence: 97%

“…[28][29][30] From an experimental point of view, measurements of quasi-one-dimensional organic samples in the direction perpendicular to the needle axis are extremely challenging and only very few results on TMTSF salts have been published. 16,[31][32][33][34][35][36][37] Here we report on temperature-dependent dc and contactless microwave measurements of the electrical conductivity in all three directions of ͑TMTSF͒ 2 PF 6 and ͑TMTSF͒ 2 ClO 4 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resistivitymentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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

et al. 2005

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“…This behavior is in contrast to the large anisotropy and distinctively different temperature dependence reported for the dc resistivity. 36,37 If spin-phonon coupling is the dominant relaxation process in quasi-one-dimensional conductors, the reduced linewidth becomes proportional to the relaxation rate of tunneling processes between chains 1/ Ќ , 38…”

Section: Linewidth and G Shiftmentioning

confidence: 99%

Electron spin resonance studies on the organic linear-chain compounds(TMTCF)2X (C=S
Dumm
¹
,
Loidl
²
,
Fravel
³

et al. 2000
Phys. Rev. B
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temperature. In contrast to the selenium analogs TMTSF which are one-dimensional metals, the sulfur salts are semiconductors with localized spins on the TMTTF dimers. Taking into account the thermal expansion of the crystals at high temperature (TϾ20 K) the ESR intensity of all sulfur compounds can be described as a spin-1/2 antiferromagnetic Heisenberg chain with exchange constants 420рJ р500 K. Although the TMTSF compounds are one-dimensional organic metals down to 10 K, the temperature dependence of the spin susceptibility can also be described within the framework of the Hubbard model in the limit of strong Coulomb repulsion with JϷ1400 K. By modeling (TMTTF) 2 ClO 4 as an alternating spin chain, the change of the alternation parameter at the first-order phase transition (T AO ϭ72.5 K) indicates a tetramerization of the chain. (TMTTF) 2 PF 6 undergoes a spin-Peierls transition at T SP ϭ19 K which can be well described by Bulaevskii's model with a singlet-triplet gap ⌬ (0)ϭ32.3 K. We find evidence of antiferromagnetic fluctuations at temperatures well above the magnetic ordering in (TMTTF) 2 Br, (TMTSF) 2 PF 6 , and (TMTSF) 2 AsF 6 which follow the critical behavior expected for three-dimensional ordering. (TMTTF) 2 PF 6 and (TMTTF) 2 Br show one-dimensional lattice fluctuations.

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“…At low temperatures the system is 2dimensional (2d) as evidenced by the observation of a plasma edge along the second most conducting (b ′ ) direction [2]. The spin-density wave (SDW) phase transition at T SDW = 12 K is the manifestation of a Fermisurface anomaly and a broad variety of related phenomena [3,4] is well understood in terms of the imperfect nesting model of a 2d Fermi gas [5]. However, with increasing temperature a 2d −→1d dimensionality crossover was suggested, which results in decoupled chains exhibiting Luttinger-liquid features [6,7].…”

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confidence: 99%

Hall Effect and Conduction Anisotropy in the Organic Conductor(TMTSF)2PF6

et al. 2000

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Both the Hall effect and the ab(')-plane conduction anisotropy are directly addressing the unconventional normal phase properties of the Bechgaard salt (TMTSF)2PF6. We found that the dramatic reduction of the carrier density deduced from recent optical data is not reflected in an enhanced Hall resistance. The pressure and temperature dependence of the b(')-direction resistivity reveal isotropic relaxation time and do not require explanations beyond the Fermi liquid theory. Our results allow a coherent-diffusive transition in the interchain carrier propagation, however the possible crossover to Luttinger liquid behavior is placed at an energy scale above room temperature.

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Anisotropic transport in the spin-density-wave state of(TMTSF)2PF6

Cited by 10 publications

References 19 publications

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

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

Electron spin resonance studies on the organic linear-chain compounds(TMTCF)2X (C=S
Dumm
¹
,
Loidl
²
,
Fravel
³

et al. 2000
Phys. Rev. B
119
11
109
0
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Hall Effect and Conduction Anisotropy in the Organic Conductor(TMTSF)2PF6

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Anisotropic transport in the spin-density-wave state of(TMTSF)2PF6

Cited by 10 publications

References 19 publications

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

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

Electron spin resonance studies on the organic linear-chain compounds(TMTCF)2X (C=SDumm1, Loidl2, Fravel3 et al. 2000Phys. Rev. B119111090View full textAdd to dashboardCite

Hall Effect and Conduction Anisotropy in the Organic Conductor(TMTSF)2PF6

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Electron spin resonance studies on the organic linear-chain compounds(TMTCF)2X (C=S
Dumm
¹
,
Loidl
²
,
Fravel
³

et al. 2000
Phys. Rev. B
119
11
109
0
View full text Add to dashboard Cite