High-pressure and high-temperature electrical resistivity of ferromagnetic transition metals: Nickel and iron

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Abstract
In this paper we report high-pressure and high-temperature electrical resistivity measurements on nickel and iron. It is observed that in nickel, the pressure coefficient of electrical resistivity changes sign and magnitude across the magnetic transition. The pressure coefficient of electrical resistivity for iron is normal and is almost independent of temperature. In nickel, the data analysis indicates that the temperature derivative of the electrical resistivity goes through a minimum at 20 kbar, which could be connected to the band-structure change and to a second-order transition. By invoking the idea of the exchange version of Baber scattering operative in paramagnetic nickel, we are able to account for the anomalous behavior of the pressure coefficient of electrical resistivity.