Dimensionality crossover in the transport behavior of the quasi–one-dimensional conductor H2(phthalocyanine)I
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Electrical-transport measurements are reported on high-purity H2(pc)I single crystals and their alloys with Ni(pc)I 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 (≈ 104 Ω-1Cm-1) at very low temperatures. A negative contribution to the magnetoresistance appears at 1.8 K consistent with weak-localization theory.
author list (cited authors)
Lee, Y., Hensley, H. H., Thompson, J. A., Murata, K., Hoffman, B. M., Haard, T. M., ... Wölfle, P.