Abstract
Pressure- and temperature-induced changes in the Ce valence and $c\ensuremath{-}f$ hybridization of the Ce115 superconductors have been studied systematically. Resonant x-ray-emission spectroscopy indicated that the increase of the Ce valence with pressure was significant for ${\mathrm{CeCoIn}}_{5}$, and moderate for $\mathrm{CeIr}{({\mathrm{In}}_{0.925}{\mathrm{Cd}}_{0.075})}_{5}$. We found no abrupt change of the Ce valence in the Kondo regime for $\mathrm{CeIr}{({\mathrm{In}}_{0.925}{\mathrm{Cd}}_{0.075})}_{5}$, which suggests that valence fluctuations are unlikely to mediate the superconductivity in this material. X-ray-diffraction results were consistent with the pressure-induced change in the Ce valence. High-resolution photoelectron spectroscopy revealed a temperature-dependent reduction of the spectral intensity at the Fermi level, indicating enhanced $c\ensuremath{-}f$ hybridization on cooling.
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