Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field

Nogami, Yasuyuki; Kaneko, Hiroshi; Ito, Hiroshi; Ishiguro, Takehiko; Sasaki, Takayoshi; Toyota, Naoki; Takahashi, Akio; Tanida, Jun

doi:10.1103/physrevb.43.11829

Cited by 82 publications

(54 citation statements)

References 41 publications

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“…This is confirmed by the transport measurement; the electrical conductivity remains finite as low as 1 mK in some highly conductive samples. [3][4][5] On the other hand, infrared active vibrational modes, which are ascribed to charged solitons in the low doping regime, persist into the heavily doped regime. 6 This suggests that the ground state in this regime is not the usual metal with a uniform bond length, but a charged soliton lattice.…”

Section: Introductionmentioning

confidence: 98%

Effects of quantum fluctuations of electrons and lattice in doped polyacetylene

Takahashi

1996

Phys. Rev. B

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The effects of quantum fluctuations of electrons and the lattice on the electronic and lattice structures of doped polyacetylene are studied using the quantum Monte Carlo method. We adopt the model where the on-site (U) and the nearest-neighbor (V) Coulomb interaction terms are added to the Su-Schrieffer-Heeger ͑SSH͒ model. In the SSH model, a charged soliton lattice survives quantum fluctuations of the lattice even in the heavily doped regime. However, the magnitude of bond-length alternation in the interface regions between charged solitons is reduced by them. In the model where UϾ0 and Vϭ0, the ground state becomes a charged soliton lattice in the low doping regime by introducing quantum fluctuations of electrons. The magnitude of the bond-length alternation in the interface regions decreases with increasing doping concentration and becomes almost zero in the heavily doped regime. In the model where UϾ0 and VϾ0, a charged soliton lattice survives quantum fluctuations of electrons and the lattice even in the heavily doped regime. However, both the magnitude of the bond-length alternation in the interface regions and the magnitude of the charge-density alternation around the soliton centers are reduced by them. The interaction between charged solitons is significantly weakened by quantum fluctuations of electrons, which results in a significant reduction of the charged soliton formation energy in the heavily doped regime. ͓S0163-1829͑96͒08535-9͔

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Section: Introductionmentioning

confidence: 98%

Effects of quantum fluctuations of electrons and lattice in doped polyacetylene

Takahashi

1996

Phys. Rev. B

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“…To form a substantial degree of order, growth methods have to consider the effect of ion penetration. [7][8][9][10][11][12][13][14][15][16] Small molecular systems have the advantage that they can be dissolved in polar solvents. Thus they can be grown in the doped form as a salt dissolved from Conductive polymers represent a rare case in which free-carrier absorption is shifted to the far-infrared-an attractive advantage in light of the requirement of highly transparent conductors across the visible and near-infrared.…”

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confidence: 99%

“…Comparable electrical performances in conductive polymers have previously been observed in stretch-oriented, doped polyacetylene and poly-p-phenylenevinylene. [5,8,[10][11][12]15,16,[45][46][47][48][49] In addition we check the impact of a strong magnetic field (B = 9 T). This allows us to switch between metallic and critical regime (magnetolocalization).…”

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confidence: 99%

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Anderson‐Localization and the Mott–Ioffe–Regel Limit in Glassy‐Metallic PEDOT

Farka

Coskun

Gąsiorowski

et al. 2017

Adv Elect Materials

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There exists a tremendous interest in metallic polymers as they combine facile processing, high conductivity and transparency. However, to date no straightforward method has been found to engineer a system that unites high doping and high order. [1][2][3][4][5][6] The apparent conflict lies in the nature of doping of a conducting polymer, which occurs through a distinct mechanism compared to inorganic semiconductors. Severe lattice distortions arise in the doping of conducting polymers as a result of the penetration of ions into the system. Consequently, the solid-state order becomes disrupted-it transforms from a former homogeneous organic vander-Waals crystal into a disordered salt. To form a substantial degree of order, growth methods have to consider the effect of ion penetration. [7][8][9][10][11][12][13][14][15][16] Small molecular systems have the advantage that they can be dissolved in polar solvents. Thus they can be grown in the doped form as a salt dissolved from Conductive polymers represent a rare case in which free-carrier absorption is shifted to the far-infrared-an attractive advantage in light of the requirement of highly transparent conductors across the visible and near-infrared. Unfortunately, prior approaches to doping these polymers-imperative for high conductance-have consistently led to strong localization arising from fluctuating band alignment among polymer chains. Here, this study overcomes this problem of doping-induced Anderson localization for the first time in polymers by developing a new conductive polymer synthesis strategy. This study achieves polymerization and doping simultaneously, thereby using an alternative nonmetal oxidant and thereby avoiding the introduction of excess energy that normally arises from exergonic polymerization. The resulting conductive polymer is the first to provide electron coherence in a metallic polymer thin film. The conductivity reaches a remarkable 3300 S cm −1 at 1.8 K and the mean electron scattering length a record 330 Å. This enhancement drives the glassy metal transition in the vicinity of the Mott-Ioffe-Regel (MIR) limit. The new metallic polymer achieves 10 −2 Ω −1 figure of merit, making it a contender for transparent conductive contacts previously only accessible using inorganics. The new material offers a uniquely broad transparency window spanning the UV to the mid-infrared. The ORCID identification number(s) for the author(s) of this article can be found under http://dx

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“…samples as published by Nogami et al, 43 but they lack the anisotropy and the high conductivity values of polyacetylene systems 55 and the difference between the MC properties of oriented and unoriented conducting polymers is usually significant. The positive contribution to the MC increases with increasing temperature and field.…”

Section: Pani-ampsa 50%mentioning

confidence: 97%

Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline films at the metal-insulator boundary

2003

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(2003) 'Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline lms at the metal-insulator boundary. ', Physical review B., 68 (24). p. 245106.Further information on publisher's website:http://dx.doi.org/10.1103/PhysRevB.68.245106Publisher's copyright statement:Reprinted with permission from the American Physical Society: Physical Review B 68, 245106 c (2003) by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modied, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Low temperature ͑down to 1.5 K͒ conductivity and high-field ͑up to 13.09ϫ10 4 Oe) magnetoconductivity measurements were performed on three different polyaniline films doped with two dopant acids. The transport behavior of those systems, which lay on either side of the metal-insulator transition, was investigated within the framework of the localization-interaction model and parameters that can implicitly determine the degree of the disorder present in the systems have been evaluated. The suitability, consistency, and limitations of the model for the study of conducting polymers close to the metal-insulator transition are thoroughly discussed.

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Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field

Cited by 82 publications

References 41 publications

Effects of quantum fluctuations of electrons and lattice in doped polyacetylene

Effects of quantum fluctuations of electrons and lattice in doped polyacetylene

Anderson‐Localization and the Mott–Ioffe–Regel Limit in Glassy‐Metallic PEDOT

Applicability of the localization-interaction model to magnetoconductivity studies of polyaniline films at the metal-insulator boundary

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