Angle-resolved photoelectron spectroscopy was measured in the Ce 3d→4f resonance energy region for the paramagnetic state of CeRu2Si 2, Ce0.84La0.16Ru2Si2 and LaRu2Si2 to investigate a variation of band structures around the quantum critical point (QCP). While the results clearly demonstrate the difference of the band structures between CeRu2Si2 and LaRu2Si2, the observed band structures of CeRu 2Si2 and Ce0.84La0.16Ru 2Si2 resemble each other. The results indicate that the Ce 4 f electrons in the paramagnetic state have an itinerant character in either side of the critical composition, and Ce1-xLaxRu 2Si2 near QCP is similar to CeRu2(Si 1-xGex)2.
- Angle-resolved photoelectron spectroscopy
- Heavy fermion
- Quantum criticality
ASJC Scopus subject areas
- Physics and Astronomy(all)