• Narrow-gap signature of Fe x Co 1-x Si single crystals
    with H. Zhang, P. C. Canfield, M. F. Hundley, Z. Fisk, J. D. Thompson, C. L. Seaman, M. B. Maple, and G. Aeppli
    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 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