Bulk 4f Electronic States of Ce-Based Heavy Fermion System Probed by High-Resolution Resonance Photoemission

Reduction of Kondo lattice effects in Yb1−xLuxAl3observed by soft x-ray photoelectron spectroscopy

“…In addition, rather broad peaks centered around 0.9 and 2.2 eV in the Yb 2+ 4f region are observed, which are derived from the surface layer. Surface electronic configurations are often different from those of bulk in many strongly correlated electron systems [5,17]. In the present SXPES results, however, the spectral intensity of the surface components is much weaker compared with the previous low-energy (20 < hν < 130 eV) PES results [18]- [21].…”

Bulk 3-D Fermi surfaces of proved by soft X-ray ARPES

“…The bulk sensitive 3d-4f resonant photoemission results for CeRu 2 Ge 2 and CeRu 2 Si 2 clarified the difference of 4f electrons' behaviors [7]. Fig.…”

“…On the other hand, ARPES can directly probe the band structures and visualize the shapes of the Fermi surfaces in a wide temperature range in contrast to the dHvA measurement which is possible only at low temperatures. Recently, highenergy photoemission with using high incident photon energies higher than 500 eV is found to be very effective in probing bulk states [7,8] and bulk Fermi surfaces [9,10].…”

Electronic structure of studied by Ce resonant photoemission

“…This reveals that the variation of the lattice constants and the conduction band states can independently give rise to the change of cf-hybridization, which causes the change of the ground states from a magnetic to non-magnetic regime through the QCP. In analyzing the Ce 4d24f RPE spectra, the surface sensitivity should be considered due to the short escape depth ð$5ÅÞ of photoelectrons [7]. For the quantitative understanding of the bulk states, the comparison with the bulk-sensitive Ce 3d-4f RPE spectra is required as performed on CeNi 1Àx Co x Ge 2 system [4].…”