Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies

Abstract

We have performed a photoemission spectroscopy (PES) study of CeM2Al10 (M = Fe, Ru, and Os) to directly observe the electronic structure involved in the unusual magnetic ordering. Soft X-ray resonant (SXR) PES provides spectroscopic evidence of the hybridization between conduction and Ce 4f electrons (c-f hybridization) and the order of the hybridization strength (Ru < Os < Fe). High-resolution (HR) PES of CeRu2Al10 and CeOs2Al10, as compared with that of CeFe2Al10, identifies two structures that can be ascribed to structures induced by the c-f hybridization and the antiferromagnetic ordering, respectively. Although the c-f hybridization-induced structure is a depletion of the spectral intensity (pseudogap) around the Fermi level (EF) with an energy scale of 20-30 meV, the structure related to the antiferromagnetic ordering is observed as a shoulder at approximately 10-11 meV within the pseudogap. The energies of the shoulder structures of CeRu2Al10 and CeOs2Al10 are approximately half of the optical gap (20 meV), indicating that EF is located at the midpoint of the gap.

17 pages, 3 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (20)

• Quantum Criticality in Heavy Fermion Metals
• Novel phase transition and the pressure effect in YbFe2Al10-type CeT2Al10 (T=Fe, Ru, Os)
• Transfer of Spectral Weight in Spectroscopies of Correlated Electron Systems
• Long-range magnetic order in CeRu2Al10 evidenced by muSR and neutron diffraction
• Structural Modification and Metamagnetic Anomaly in the Ordered State of CeOs2Al10
• Possible Long-Range Order with Singlet Ground State in CeRu2Al10
• Long-range order and low-energy magnetic excitations in CeRu2Al10
• Electronic-Structure-Driven Magnetic Ordering in a Kondo Semiconductor CeOs2Al10
• Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10
• Optical study of charge instability in CeRu2Al10 in comparison with CeOs2Al10 and CeFe2Al10
• Anisotropic spin-dynamics in the Kondo semiconductor CeRu2Al10
• Anisotropic Electronic Structure of the Kondo Semiconductor CeFe2Al10 Studied by Optical Conductivity
• High-field magnetization and magnetic phase transition in CeOs2Al10
• Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (x=0 to 1): magnetic ordering emerging from the Kondo semiconducting state
• Change of magnetic ground state by light electron-doping in CeOs2Al10
• muSR and inelastic neutron scattering investigations of the caged type Kondo semimetals: CeT2Al10 (T=Fe, Ru and Os)
• Another dimension: investigations of molecular magnetism using muon-spin relaxation
• Magnetization and Magnetoresistance of CeRu2Al10 under High Magnetic Fields along c-Axis
• Suppression of antiferromagnetic order and hybridization gap by electron- and hole-doping in the Kondo semiconductor CeOs${}_2$Al${}_{10}$
• Magnetic instability induced by Rh-doping in Kondo semiconductor CeRu${}_2$Al${}_{10}$

Cited by in corpus (5)

• Quantitative study of valence and configuration interaction parameters of the Kondo semiconductors CeM2Al10 (M = Ru, Os and Fe) by means of bulk-sensitive hard x-ray photoelectron spectroscopy
• High temperature antiferromagnetism in Yb based heavy fermion systems proximate to a Kondo insulator
• Tuning the hybridization and magnetic ground state of electron and hole doped CeOs${}_2$Al${}_{10}$: an x-ray spectroscopy study
• A crossover from Kondo semiconductor to metallic antiferromagnet with $5d$-electron doping in CeFe${}_2$Al${}_{10}$
• CeFe${}_2$Al${}_{10}$: a Correlated Metal with a Fermi Surface Exhibiting Nonmetallic Conduction