New Phase Boundary for Cerium

Abstract

The phase boundary for the high-pressure superconducting ${\ensuremath{\alpha}}^{\ensuremath{'}}$ phase of cerium has been determined from 77 to 480\ifmmode^\circ\else\textdegree\fi{}K from observations of the resistance anomaly which occurs at the $\ensuremath{\alpha}\ensuremath{\rightarrow}{\ensuremath{\alpha}}^{\ensuremath{'}}$ transition. The observed transition pressure at 297\ifmmode^\circ\else\textdegree\fi{}K is 55.8\ifmmode\pm\else\textpm\fi{}0.5 kbar, varying linearly with temperature with $\frac{\ensuremath{\partial}P}{\ensuremath{\partial}T=\ensuremath{-}34.9}$ bar/deg. The change in the electronic properties of cerium as a function of pressure is discussed.