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. 2015 Mar 17;5:9158. doi: 10.1038/srep09158

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(a) Temperature dependence of the electrical resistivity up to 300 K. Inset: low-temperature resistivity data revealing a superconducting transition near 2 K. (b) Temperature dependence of the electrical conductivity in the normal state fitted by the function σ(T) = σ_m(T) + σ_s(T) (red line) described in the text. The metallic and semiconducting contributions are represented by blue and green curves, respectively.