Abstract:Interlayer-resistivity measurements have been performed on a variety of single crystals of the quasi-two-dimensional organic superconductor k-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br. These crystals, which have been synthesized along two somewhat different routes, reveal strongly sample-dependent resistivity profiles: while the majority of samples shows a more or less pronounced r(T) maximum around 90 K with a semiconducting behaviour above, some crystals remain metallic at all temperatures T 300 K. In the absence of signi… Show more
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