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

Yoshio Nogami, H. Kaneko, H. Ito, T. Ishiguro, T. Sasaki, N. Toyota, A. Takahashi, J. Tsukamoto

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The temperature dependence of the electrical conductivity and the low-temperature magnetoresistance for iodine-doped highly conducting polyacetylenes are reported. The overall behavior of the temperature dependence is explained in terms of the phenomenological Sheng model, but the selection of parameter values is not unique, suggesting that the model is not sufficient to characterize the samples. The temperature dependence changes rather drastically with the conductivity, which is determined by the doping concentration and chemical reactions within (CH)x. The magnetic-field effect is rather insensitive to the field direction. This indicates that the classical orbital effect is not the principal cause. The magnetoresistance is negative for the sample with the highest conductivity, and its magnitude exceeds by far the upper bound arising from the quantum correction based on weak-localization theory for isotropic media. We evaluate the effect of the anisotropy in the electron diffusivity on the magnitude. With a decrease in conductivity, positive magnetoresistance emerges at low magnetic fields. The drastic variations of the temperature and the magnetic-field dependence with the conductivity show that the highly conducting polyacetylene is close to the metal-nonmetal transition boundary.

Original languageEnglish
Pages (from-to)11829-11839
Number of pages11
JournalPhysical Review B
Volume43
Issue number14
DOIs
Publication statusPublished - 1991
Externally publishedYes

Fingerprint

Polyacetylenes
polyacetylene
Magnetic fields
conduction
Magnetoresistance
conductivity
electrical resistivity
magnetic fields
temperature dependence
Temperature
isotropic media
Magnetic field effects
Nonmetals
iodine
diffusivity
chemical reactions
Iodine
transition metals
methylidyne
Chemical reactions

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Nogami, Y., Kaneko, H., Ito, H., Ishiguro, T., Sasaki, T., Toyota, N., ... Tsukamoto, J. (1991). Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field. Physical Review B, 43(14), 11829-11839. https://doi.org/10.1103/PhysRevB.43.11829

Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field. / Nogami, Yoshio; Kaneko, H.; Ito, H.; Ishiguro, T.; Sasaki, T.; Toyota, N.; Takahashi, A.; Tsukamoto, J.

In: Physical Review B, Vol. 43, No. 14, 1991, p. 11829-11839.

Research output: Contribution to journalArticle

Nogami, Y, Kaneko, H, Ito, H, Ishiguro, T, Sasaki, T, Toyota, N, Takahashi, A & Tsukamoto, J 1991, 'Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field', Physical Review B, vol. 43, no. 14, pp. 11829-11839. https://doi.org/10.1103/PhysRevB.43.11829
Nogami, Yoshio ; Kaneko, H. ; Ito, H. ; Ishiguro, T. ; Sasaki, T. ; Toyota, N. ; Takahashi, A. ; Tsukamoto, J. / Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field. In: Physical Review B. 1991 ; Vol. 43, No. 14. pp. 11829-11839.
@article{61f675202e4d49f2806fb6e9be785622,
title = "Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field",
abstract = "The temperature dependence of the electrical conductivity and the low-temperature magnetoresistance for iodine-doped highly conducting polyacetylenes are reported. The overall behavior of the temperature dependence is explained in terms of the phenomenological Sheng model, but the selection of parameter values is not unique, suggesting that the model is not sufficient to characterize the samples. The temperature dependence changes rather drastically with the conductivity, which is determined by the doping concentration and chemical reactions within (CH)x. The magnetic-field effect is rather insensitive to the field direction. This indicates that the classical orbital effect is not the principal cause. The magnetoresistance is negative for the sample with the highest conductivity, and its magnitude exceeds by far the upper bound arising from the quantum correction based on weak-localization theory for isotropic media. We evaluate the effect of the anisotropy in the electron diffusivity on the magnitude. With a decrease in conductivity, positive magnetoresistance emerges at low magnetic fields. The drastic variations of the temperature and the magnetic-field dependence with the conductivity show that the highly conducting polyacetylene is close to the metal-nonmetal transition boundary.",
author = "Yoshio Nogami and H. Kaneko and H. Ito and T. Ishiguro and T. Sasaki and N. Toyota and A. Takahashi and J. Tsukamoto",
year = "1991",
doi = "10.1103/PhysRevB.43.11829",
language = "English",
volume = "43",
pages = "11829--11839",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "14",

}

TY - JOUR

T1 - Low-temperature electrical conductivity of highly conducting polyacetylene in a magnetic field

AU - Nogami, Yoshio

AU - Kaneko, H.

AU - Ito, H.

AU - Ishiguro, T.

AU - Sasaki, T.

AU - Toyota, N.

AU - Takahashi, A.

AU - Tsukamoto, J.

PY - 1991

Y1 - 1991

N2 - The temperature dependence of the electrical conductivity and the low-temperature magnetoresistance for iodine-doped highly conducting polyacetylenes are reported. The overall behavior of the temperature dependence is explained in terms of the phenomenological Sheng model, but the selection of parameter values is not unique, suggesting that the model is not sufficient to characterize the samples. The temperature dependence changes rather drastically with the conductivity, which is determined by the doping concentration and chemical reactions within (CH)x. The magnetic-field effect is rather insensitive to the field direction. This indicates that the classical orbital effect is not the principal cause. The magnetoresistance is negative for the sample with the highest conductivity, and its magnitude exceeds by far the upper bound arising from the quantum correction based on weak-localization theory for isotropic media. We evaluate the effect of the anisotropy in the electron diffusivity on the magnitude. With a decrease in conductivity, positive magnetoresistance emerges at low magnetic fields. The drastic variations of the temperature and the magnetic-field dependence with the conductivity show that the highly conducting polyacetylene is close to the metal-nonmetal transition boundary.

AB - The temperature dependence of the electrical conductivity and the low-temperature magnetoresistance for iodine-doped highly conducting polyacetylenes are reported. The overall behavior of the temperature dependence is explained in terms of the phenomenological Sheng model, but the selection of parameter values is not unique, suggesting that the model is not sufficient to characterize the samples. The temperature dependence changes rather drastically with the conductivity, which is determined by the doping concentration and chemical reactions within (CH)x. The magnetic-field effect is rather insensitive to the field direction. This indicates that the classical orbital effect is not the principal cause. The magnetoresistance is negative for the sample with the highest conductivity, and its magnitude exceeds by far the upper bound arising from the quantum correction based on weak-localization theory for isotropic media. We evaluate the effect of the anisotropy in the electron diffusivity on the magnitude. With a decrease in conductivity, positive magnetoresistance emerges at low magnetic fields. The drastic variations of the temperature and the magnetic-field dependence with the conductivity show that the highly conducting polyacetylene is close to the metal-nonmetal transition boundary.

UR - http://www.scopus.com/inward/record.url?scp=0000290391&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000290391&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.43.11829

DO - 10.1103/PhysRevB.43.11829

M3 - Article

AN - SCOPUS:0000290391

VL - 43

SP - 11829

EP - 11839

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 14

ER -