Suppression of the $\gamma -\alpha$ structural phase transition in $C{e}_{0.8}L{a}_{0.1}T{h}_{0.1}$ by large magnetic fields

Abstract

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.

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