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Narrow-gap signature of FexCo1−xSi single crystals


Heat capacity, resistance, and magnetic susceptibility have been measured on FeSi, Fe0.90Co0.10Si, Fe0.10Co0.10Si, and CoSi single crystals. From resistance experiments, the activation energy (Δ) shows a small variation from Δ≈310 K in FeSi to Δ≈325 K for the Fe0.90Co0.10Si compound. For the 90% Co compound the gap signature disappears completely. Heat capacity experiments performed in the temperature range 1.5 K

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