Abstract
Pressure- and temperature-induced changes in the Ce valence and 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 , and moderate for . We found no abrupt change of the Ce valence in the Kondo regime for , 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 hybridization on cooling.
- Received 3 September 2015
- Corrected 17 December 2015
DOI:https://doi.org/10.1103/PhysRevB.92.235110
©2015 American Physical Society
Corrections
17 December 2015