4f-derived Fermi Surfaces of CeRu2(Si[1-x]Ge[x])2 near the Quantum Critical Point: Resonant Soft X-ray ARPES Study

Abstract

Angle-resolved photoelectron spectroscopy in the Ce 3d-4f excitation region was measured for the paramagnetic state of CeRu2Si2, CeRu2(Si0.82Ge0.18)2, and LaRu2Si2 to investigate the changes of the 4$f$ electron Fermi surfaces around the quantum critical point. While the difference of the Fermi surfaces between CeRu2Si2 and LaRu2Si2 was experimentally confirmed, a strong 4f-electron character was observed in the band structures and the Fermi surfaces of CeRu2Si2 and CeRu2(Si0.82Ge0.18)2, consequently indicating a delocalized nature of the 4$f$ electrons in both compounds. The absence of Fermi surface reconstruction across the critical composition suggests that SDW quantum criticality is more appropriate than local quantum criticality in CeRu2(Si[1-x]Ge[x])2.

4 pages, 5 figures

References in corpus (5)

• Quantum Criticality in Heavy Fermion Metals
• Quantum criticality in the cubic heavy-fermion system CeIn_{3-x}Sn_x
• Electronic structures of CeRu${}_2{X}_2$ ($X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy
• Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion
• Non-local Magnetic Field-tuned Quantum Criticality in Cubic CeIn_{3-x}Sn_x (x=~0.25)

Cited by in corpus (3)

• Fermi Surface Properties, Metamgnetic Transition and Quantum Phase Transition of CeRu${}_2$Si${}_2$ and Its Alloys Probed by the dHvA Effect--Fermi Surface Studies on the Itinerant and Localized Dichotomy of $f$ Electron Nature
• Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2
• Photo-emission signatures of coherence breakdown in Kondo alloys: dynamical mean-field theory approach