Magnetic properties of Pu(1−x)Amx solid solutions

Substitution of plutonium (Pu) by so-called deltagen elements (Ga, Al, Am, Ce…) allows us to stabilize the high-temperature expanded fcc δ-phase of Pu at room temperature or down to 4 K, depending on the concentration of the deltagen.1 The nature of this stabilization is still a question of fundamental interest.