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

Dressel, Martin; Petukhov, K.; Salameh, B.; Zornoza, Pedro; Giamarchi, Thierry

doi:10.1103/physrevb.71.075104

Cited by 50 publications

(71 citation statements)

References 53 publications

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“…Bechgaard salts are a well-documented family of quasi-one dimensional conductors hosting a density-wave transition as a consequence of nesting. In the spin-density-wave of (TMTSF) 2 PF 6 , all three components of resistivity display an activated behavior with a gap of similar amplitude [24]. This is not surprising, since such a transition opens a gap in the Density Of States (DOS), which affects the conductivity along all orientations.…”

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confidence: 98%

Two Phase Transitions Induced by a Magnetic Field in Graphite

et al. 2013

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Different instabilities have been speculated for a three-dimensional electron gas confined to its lowest Landau level. The phase transition induced in graphite by a strong magnetic field, and believed to be a Charge Density Wave (CDW), is the only experimentally established case of such instabilities. Studying the magnetoresistance in graphite for the first time up to 80 T, we find that the magnetic field induces two successive phase transitions, consisting of two distinct ordered states each restricted to a finite field window. In both states, an energy gap opens up in the out-ofplane conductivity and coexists with an unexpected in-plane metallicity for a fully gap bulk system. Such peculiar metallicity may arise as a consequence of edge-state transport expected to develop in presence of a bulk gap.Graphite is a compensated semi-metal with a tiny three-dimensional Fermi surface and is described by the Slonczewski-Weiss-McClure (SWM) band model [1,2]. A modest magnetic field of 7.5 T perpendicular to the graphene layers confines electrons and holes to their lowest Landau levels (LLs). It is therefore an ideal candidate to explore the nature of the electronic ground state of a three-dimensional electron gas pushed beyond the socalled quantum limit. In this regime [3], the electronic spectrum becomes analogue to a one-dimensional system with a variety of possible instabilities [4][5][6]. In the early eighties, a phase transition in this system was discovered by Tanuma and co-workers who reported a sharp increase in the in-plane magnetoresistance of graphite at B≈25 T [8]. Numerous experimental studies followed [9][10][11][12][13][14][15] and confirmed the existence of a field-induced many-body state beyond a temperature-dependent critical magnetic field. Soon after the initial experimental discovery, Yoshioka and Fukuyama (YF) [16] ascribed this instability to a charge-density-wave (CDW). Such an instability is favored by one-dimensionality, because of the availability of a suitable (2k F ) nesting vector. In the original YF scenario, the CDW in adjacent valleys are out of phase, creating a valley density wave state [17], in order to minimize Coloumb energy. In 1998, by further increasing the magnetic field, Yaguchi and Singleton found that the field-induced state is eventually destroyed beyond 53 T [13]. This destruction was attributed to the depopulation of a Landau sub-level within the framework of YF scenario. The possible multiplicity of induced phases and their signatures in the in-plane and out of-plane charge transport remain open questions (for a review see [18]). Therefore, despite a large body of research on graphite at high magnetic field, the nature of its electronic ground state is not settled. In addition, these investigations can * benoit.fauque@espci.fr provide interesting input to the debate on the importance of many-body physics and its evolution with dimensionality in graphene [7].In this letter, we extend the previous measurements up to a magnetic field as strong as 80 T and focus on the contr...

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confidence: 98%

Two Phase Transitions Induced by a Magnetic Field in Graphite

et al. 2013

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“…Upon cooling, the one-particle properties exhibit a 1D to two-dimensional (2D) crossover around 100 K (T * ), the temperature below which the charge transport becomes coherent in the (a, b) TMTSF layers. 14,15 For T < T * the warping of the Fermi surface (FS) disables the divergence of the 1D longitudinal 2k F BOW response, 16 which saturates below T * and then decreases below T * * ∼ 50 K to finally vanish at about T * * * ∼ 20 K. 13 In contrast, the 2k F SDW response together with the interstack correlations achieved by the nesting of the warped FS continue to grow below T * . 17 Then the 2k F SDW response diverges critically below T * * * (Ref.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature structural effects in the (TMTSF)2PF6and AsF6Bechgaard salts

et al. 2013

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We present a detailed low-temperature investigation of the statics and dynamics of the anions and methyl groups in the organic conductors (TMTSF) 2 PF 6 and (TMTSF) 2 AsF 6 (TMTSF: tetramethyl-tetraselenafulvalene). The 4 K neutron-scattering structure refinement of the fully deuterated (TMTSF) 2 PF 6 -D12 salt allows locating precisely the methyl groups at 4 K. This structure is compared to the one of the fully hydrogenated (TMTSF) 2 PF 6 -H12 salt previously determined at the same temperature. Surprisingly, it is found that deuteration corresponds to the application of a negative pressure of 5 × 10 2 MPa to the H12 salt. Accurate measurements of the Bragg intensity show anomalous thermal variations at low temperature both in the deuterated PF 6 and AsF 6 salts. Two different thermal behaviors have been distinguished. Small Bragg-angle measurements reflect the presence of low-frequency modes at characteristic energies θ E = 8.3 K and θ E = 6.7 K for the PF 6 -D12 and AsF 6 -D12 salts, respectively. These modes correspond to the low-temperature methyl group motion. Large Bragg-angle measurements evidence an unexpected structural change around 55 K, which probably corresponds to the linkage of the anions to the methyl groups via the formation of F. . .D-CD 2 bonds observed in the 4 K structural refinement. Finally we show that the thermal expansion coefficient of (TMTSF) 2 PF 6 is dominated by the librational motion of the PF 6 units. We quantitatively analyze the low-temperature variation of the lattice expansion via the contribution of Einstein oscillators, which allows us to determine for the first time the characteristic frequency of the PF 6 librations: θ E ≈ 50 K and θ E = 76 K for the PF 6 -D12 and PF 6 -H12 salts, respectively.

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“…24) This means that the effect of thermal expansion on transport measurements is a serious problem below 1 GPa. [25][26][27] In our case, the metallic state appears under pressures beyond 5.7 GPa ( 0.4 GPa), where the constant-volume of (TTM-TTP)I 3 will be obtained for a wide-temperature region because of very high compression. Moreover, our cubic anvil pressure apparatus rigorously maintains constant pressure in the course of the temperature cycle.…”

Section: Resultsmentioning

confidence: 99%

Metallization of the Organic Conductor (TTM-TTP)I₃with a Highly One-Dimensional Half-Filled Band under Pressure beyond 7 GPa

et al. 2007

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It is theoretically predicted that the ground state of the one-dimensional (1D) half-filled system is the Mott insulator at any positive on-site Coulomb interaction U . In this paper, we demonstrate that (TTM-TTP)I3 with a highly 1D half-filled energy band is almost metallized by the application of pressure beyond 7 GPa. We find that the metal-insulator transition temperature decreases linearly with increasing pressure and is directing towards 0 K near 10 GPa. Above 5.7 GPa, the metallic behaviors are observed in the high-temperature region for 70 < T < 300 K, in which the temperature dependence of the resistivity is described by ρ(T ) ∝ T α with α ∼ 0.3. The nature of the metallic state is discussed in terms of the Tomonaga-Luttinger liquid described by the Hubbard model. KEYWORDS: (TTM-TTP)I3, organic conductor, one-dimensional system, half-filling, high-pressure, Tomonaga-Luttinger liquid, Hubbard model, Kρ IntroductionMetal-insulator (MI) transitions by Coulomb interaction are accompanied with huge resistance change and are widely observed in strongly correlated systems. Many theories of strongly correlated systems begin with a Hubbard model because of its simplicity.1) The Hubbard model is the prototypical model used for the description of correlated fermions in a variety of materials, ranging from high-T c superconductors to heavy fermion compounds and organic molecular crystals. In spite of its apparent simplicity, there is still no general solution, or even a consensus on its fundamental properties for the Hubbard model. Notable exceptions are the cases of oneand infinite-dimensions.2, 3) In one-dimension, an exact solution is available.4) Especially, the one-dimensional (1D) half-filled case is special but important because it corresponds to the strong coupling limit of the Hubbard model, i.e., U → ∞. 5) That is, no matter how small U is, the ground state is the Mott insulator. Thus metallization of the 1D half-filled system is one of the most challenging problems in the strongly correlated electronic systems.In this paper, we report the metallization of (TTM-TTP)I 3 with a highly 1D half-filled band, 6) where TTM-TTP stands for 2,5-bis[4,5-bis(methylthio)-1,3-dithiol-2-ylidene]-1,3,4,6-tetrathiapentalene [see Fig. 1(a)]. 7,8) In the interchain directions, the TTM-TTP molecules cannot approach close to each other because of the steric hindrance of the terminal -SCH 3 groups.7) According to the band structure calculation, the interchain interactions, t a , t b (< 0.01 eV) are less than 1/20 of the intrachain interaction, t c = 0.26 eV, which is much more onedimensional than the typical quasi-1D Bechgaard salts.

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

Cited by 50 publications

References 53 publications

Two Phase Transitions Induced by a Magnetic Field in Graphite

Two Phase Transitions Induced by a Magnetic Field in Graphite

Low-temperature structural effects in the (TMTSF)2PF6and AsF6Bechgaard salts

Metallization of the Organic Conductor (TTM-TTP)I₃with a Highly One-Dimensional Half-Filled Band under Pressure beyond 7 GPa

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

Cited by 50 publications

References 53 publications

Two Phase Transitions Induced by a Magnetic Field in Graphite

Two Phase Transitions Induced by a Magnetic Field in Graphite

Low-temperature structural effects in the (TMTSF)2PF6and AsF6Bechgaard salts

Metallization of the Organic Conductor (TTM-TTP)I3with a Highly One-Dimensional Half-Filled Band under Pressure beyond 7 GPa

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Metallization of the Organic Conductor (TTM-TTP)I₃with a Highly One-Dimensional Half-Filled Band under Pressure beyond 7 GPa