Magnetic Susceptibility of Cerium Metal Under Pressure

Abstract

The demagnetization of the $4f$ state of metallic Ce as function of pressure was studied by magnetic susceptibility measurements. In contrast to the $\ensuremath{\beta}$ and $\ensuremath{\gamma}$ phases, the collapsed $\ensuremath{\alpha}$ phase does not show a local moment but exhibits instead a strong local exchange enhancement of the susceptibility. The susceptibility decreases linearly with increasing pressure in our measuring range and is estimated to decrease by 80% between the boundaries of the magnetic and the superconducting phases. The results are consistent with the Anderson model of local moment formation over the entire range of interest of the parameter ${E}_{4f}\ensuremath{-}{E}_{\mathrm{F}}$.