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Pressure effects on electrical conductivities in intercalated graphite and doped polypyrrole
Umeå University, Faculty of Science and Technology, Physics.
Umeå University, Faculty of Science and Technology, Physics.
1984 (English)In: Journal de Physique Colloque vol. 45: Supplément C8, Physics and Physicochemistry of Highly Condensed Matter; Proceedings of the XXIInd Meeting of the EHPRG, Aussois, Sept. 1984, 1984, 213-216 p.Conference paper (Refereed)
Abstract [en]

We have measured the pressure dependence up to 2.5 GPa of the electrical resistance of the acceptor intercalated graphites CnFeCl3, CnSbF5, and CnHNO3. The slope of resistance versus pressure is approximately the same in all cases. Two different types of high pressure transitions are observed in CnSbF5 and CnHNO3. The results of electrical resistance measurements under pressure in polypyrrole are consistent with a simple extension of the variable-range-hopping model. We infer for this material that the density of states at the Fermi level increases with pressure.

Place, publisher, year, edition, pages
1984. 213-216 p.
, Journal de Physique Colloques, volume 45, C8
Keyword [en]
Electrical conductivity, intercalation compound, graphite, FeCl3, SbF5, HNO3, polypyrrole, hopping conductivity, high pressure
National Category
Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-25847DOI: 10.1051/jphyscol:1984840OAI: diva2:234335
Original French Abstract: Nous avons mesuré la résistivité électrique, jusqu'à 2.5 GPa et à la température ambiante, des graphites intercalés CnFeCl3, CnSbF5 et CnHNO3. L'augmentation de la résistance jusqu'à 2.5 GPa est sensiblement la même dans les trois cas. On a constaté une transition de phase dans chacun des deux derniers matériaux, les caractéristiques de ces transitions etant différentes. Nos résultats sur la variation de la résistance du polypyrrole sont en accord avec la théorie de "sauts à pas variable". II paraît que la densité d'états au niveau Fermi augmente avec la pression.Available from: 2009-09-07 Created: 2009-09-07 Last updated: 2010-02-03

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Sundqvist, Bertil
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Condensed Matter Physics

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