Abstract

The electrical resistivity and specific heat of samples of /sup 2/41Am and /sup 2/43Am 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. These features lead to the conclusion that americium is the first of the actinides in which the 5f electrons are essentially localized. Anomalies occur in the electrical resistivity and in the specific heat in the region of 60K, the cause of which is unknown.

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