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Suppression of tunnel transport by magnetic field in polypyrrole

Reghu, M and Subramanyam, SV (1990) Suppression of tunnel transport by magnetic field in polypyrrole. In: Physics Letters A, 145 (6-7). pp. 371-375.

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The anomalous charge transport in conducting polymer polypyrrole from the resistivity measurements at low temperature is due to the presence of polarons and bipolarons in these materials. The deviation from the hopping fit in the resistivity in the region below 4 K is attributed to the tunneling contribution to the conductivity. The number of bipolarons is larger in heavily doped samples leading to higher resistivity values at low temperatures, than in lightly doped samples, due to the low mobility of bipolarons. Tunnel transport becomes more difficult in the presence of a magnetic field due to the shrinkage of the Bohr radius of localised states.

Item Type: Journal Article
Publication: Physics Letters A
Publisher: Elsevier Science B.V.
Additional Information: Copyright of this article belongs to Elsevier Science B.V.
Keywords: tunnel transport;magnetic field;polypyrrole
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Feb 2008
Last Modified: 19 Sep 2010 04:41
URI: http://eprints.iisc.ac.in/id/eprint/12608

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