Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure

Heikki Isotalo, Jari Paloheimo, Y. Miura, Reiko Azumi, Mitsuyoshi Matsumoto, Takayoshi Nakamura

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Abstract

The electrical conductivity of electrochemically oxidized Langmuir-Blodgett films of tridecylmethylammonium-Au(dmit)2 and icosanoic acid has been studied. The measurements were performed at temperatures down to 3 K and hydrostatic pressures up to 17 kbar, and also at high electric fields up to 3.2 kV/cm. The results support the view that the films consist of relatively large metallic islands, separated by thin barriers, and indicate that the low-temperature conductivity with dσ/dT>0 originates from thermal-fluctuation-induced tunneling. At higher temperatures dσ/dT<0 because of the finite resistance of the metallic islands. The conductivity increased upon applied pressure, and the temperature of the maximum conductivity shifted to lower temperature without any pronounced saturation. The ambient-pressure room-temperature conductivity of the best conducting samples could be increased by a factor of about 2 at 10-kbar hydrostatic pressure and further to 140 S/cm at the temperature of the maximum conductivity at 51 K.
Original languageEnglish
Pages (from-to)1809-1816
JournalPhysical Review B: Condensed Matter
Volume51
Issue number3
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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Langmuir Blodgett films
Hydrostatic pressure
Langmuir-Blodgett films
hydrostatic pressure
conductivity
Temperature
temperature
saturation
conduction
acids
electrical resistivity
electric fields
room temperature
Electric fields
Acids

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Isotalo, Heikki ; Paloheimo, Jari ; Miura, Y. ; Azumi, Reiko ; Matsumoto, Mitsuyoshi ; Nakamura, Takayoshi. / Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure. In: Physical Review B: Condensed Matter. 1995 ; Vol. 51, No. 3. pp. 1809-1816.
@article{c3c7b1dc4cba41eeb65f517823cae0a0,
title = "Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure",
abstract = "The electrical conductivity of electrochemically oxidized Langmuir-Blodgett films of tridecylmethylammonium-Au(dmit)2 and icosanoic acid has been studied. The measurements were performed at temperatures down to 3 K and hydrostatic pressures up to 17 kbar, and also at high electric fields up to 3.2 kV/cm. The results support the view that the films consist of relatively large metallic islands, separated by thin barriers, and indicate that the low-temperature conductivity with dσ/dT>0 originates from thermal-fluctuation-induced tunneling. At higher temperatures dσ/dT<0 because of the finite resistance of the metallic islands. The conductivity increased upon applied pressure, and the temperature of the maximum conductivity shifted to lower temperature without any pronounced saturation. The ambient-pressure room-temperature conductivity of the best conducting samples could be increased by a factor of about 2 at 10-kbar hydrostatic pressure and further to 140 S/cm at the temperature of the maximum conductivity at 51 K.",
author = "Heikki Isotalo and Jari Paloheimo and Y. Miura and Reiko Azumi and Mitsuyoshi Matsumoto and Takayoshi Nakamura",
year = "1995",
doi = "10.1103/PhysRevB.51.1809",
language = "English",
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Isotalo, H, Paloheimo, J, Miura, Y, Azumi, R, Matsumoto, M & Nakamura, T 1995, 'Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure', Physical Review B: Condensed Matter, vol. 51, no. 3, pp. 1809-1816. https://doi.org/10.1103/PhysRevB.51.1809

Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure. / Isotalo, Heikki; Paloheimo, Jari; Miura, Y.; Azumi, Reiko; Matsumoto, Mitsuyoshi; Nakamura, Takayoshi.

In: Physical Review B: Condensed Matter, Vol. 51, No. 3, 1995, p. 1809-1816.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Conductivity of tridecylammonium - Au (dmit)2 Langmuir-Blodgett films under hydrostatic pressure

AU - Isotalo, Heikki

AU - Paloheimo, Jari

AU - Miura, Y.

AU - Azumi, Reiko

AU - Matsumoto, Mitsuyoshi

AU - Nakamura, Takayoshi

PY - 1995

Y1 - 1995

N2 - The electrical conductivity of electrochemically oxidized Langmuir-Blodgett films of tridecylmethylammonium-Au(dmit)2 and icosanoic acid has been studied. The measurements were performed at temperatures down to 3 K and hydrostatic pressures up to 17 kbar, and also at high electric fields up to 3.2 kV/cm. The results support the view that the films consist of relatively large metallic islands, separated by thin barriers, and indicate that the low-temperature conductivity with dσ/dT>0 originates from thermal-fluctuation-induced tunneling. At higher temperatures dσ/dT<0 because of the finite resistance of the metallic islands. The conductivity increased upon applied pressure, and the temperature of the maximum conductivity shifted to lower temperature without any pronounced saturation. The ambient-pressure room-temperature conductivity of the best conducting samples could be increased by a factor of about 2 at 10-kbar hydrostatic pressure and further to 140 S/cm at the temperature of the maximum conductivity at 51 K.

AB - The electrical conductivity of electrochemically oxidized Langmuir-Blodgett films of tridecylmethylammonium-Au(dmit)2 and icosanoic acid has been studied. The measurements were performed at temperatures down to 3 K and hydrostatic pressures up to 17 kbar, and also at high electric fields up to 3.2 kV/cm. The results support the view that the films consist of relatively large metallic islands, separated by thin barriers, and indicate that the low-temperature conductivity with dσ/dT>0 originates from thermal-fluctuation-induced tunneling. At higher temperatures dσ/dT<0 because of the finite resistance of the metallic islands. The conductivity increased upon applied pressure, and the temperature of the maximum conductivity shifted to lower temperature without any pronounced saturation. The ambient-pressure room-temperature conductivity of the best conducting samples could be increased by a factor of about 2 at 10-kbar hydrostatic pressure and further to 140 S/cm at the temperature of the maximum conductivity at 51 K.

U2 - 10.1103/PhysRevB.51.1809

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