Suppression of the γ–α structural phase transition in Ce0.8La0.1Th0.1 by large magnetic fields

The γ–α transition in Ce0.8La0.1Th0.1 is measured as a function of applied magnetic field using both resistivity and magnetization. The γ–α transition temperature decreases with increasing magnetic field, reaching zero temperature at around 56 T. The magnetic-field dependence of the transition temperature is quantitatively reproduced by a model that invokes the field and temperature dependence of the entropy of the 4f-electron moments of the γ phase.