The $\gamma-\alpha$ transition in Ce$_{ 0.8}$La$_{ 0.1}$Th$_{ 0.1}$ is measured as a function of applied magnetic field using both resistivity and magnetization. The $\gamma - \alpha$ transition temperature decreases with increasing magnetic field, reaching zero temperature at around 56 T. The magnetic-field dependence of the transition temperature may be fitted using a model that invokes the field and temperature dependence of the entropy of the $4f$-electron moments of the $\gamma$ phase, suggesting that the volume collapse in Ce and its alloys is primarily driven by entropic considerations.
Categories: cond-mat.str-el cond-mat.mtrl-sci