The electrical resistivity and specific heat of samples of 241Am and 243Am are reported. The electrical resistivity at room temperature is reduced compared with the value for plutonium, while the power law exponent at low temperatures is increased. The electronic specific heat coefficient is lower than for the lighter actinides. These features lead to the conclusion that americium is the first of the actinides in which the 5 f electrons are essentially localized. Anomalies occur in the electrical resistivity and in the specific heat in the region of 60 K, the cause of which is unknown.
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Müller, W., Schenkel, R., Schmidt, H.E. et al. The electrical resistivity and specific heat of americium metal. J Low Temp Phys 30, 561–578 (1978). https://doi.org/10.1007/BF00116197
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DOI: https://doi.org/10.1007/BF00116197