Volume 36, Number 9, December III 1996
|Page(s)||681 - 686|
|Section||Atomic, molecular and optical physics|
|Published online||01 September 2002|
Dimensionality crossover in the transport behavior of the quasi–one-dimensional conductor H2(phthalocyanine)I
Department of Physics and Astronomy,
Northwestern University, Evanston, IL 60208, USA
2 Department of Chemistry, and Materials Research Center, Northwestern University, Evanston, IL 60208, USA
3 Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany
Accepted: 1 November 1996
Electrical-transport measurements are reported on high-purity single crystals and their alloys with in the temperature range from room temperature to 20 mK and in magnetic fields up to 5.5 T. We have observed a sharp maximum in conductivity at 1.8 K which we attribute to crossover from one- to three-dimensional behavior. The conductivity follows a simple quadratic temperature dependence below 1.8 K and remains metallic ( ) at very low temperatures. A negative contribution to the magnetoresistance appears at 1.8 K consistent with weak-localization theory.
PACS: 36.20.Fz – Constitution (chains and sequences) / 73.20.Fz – Weak localization effects (e.g., quantized states)
© EDP Sciences, 1996
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