Anisotropic Electronic Structure of the Kondo Semiconductor CeFe2Al10 Studied by Optical Conductivity

Abstract

We report temperature-dependent polarized optical conductivity [$\sigma (\omega )$] spectra of CeFe${}_2$Al${}_{10}$, which is a reference material for CeRu${}_2$Al${}_{10}$ and CeOs${}_2$Al${}_{10}$ with an anomalous magnetic transition at 28 K. The $\sigma (\omega )$ spectrum along the b-axis differs greatly from that in the $ac$-plane, indicating that this material has an anisotropic electronic structure. At low temperatures, in all axes, a shoulder structure due to the optical transition across the hybridization gap between the conduction band and the localized $4f$ states, namely $c$-$f$ hybridization, appears at 55 meV. However, the gap opening temperature and the temperature of appearance of the quasiparticle Drude weight are strongly anisotropic indicating the anisotropic Kondo temperature. The strong anisotropic nature in both electronic structure and Kondo temperature is considered to be relevant the anomalous magnetic phase transition in CeRu${}_2$Al${}_{10}$ and CeOs${}_2$Al${}_{10}$.

5 pages, 4 figures

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Cited by in corpus (16)

• Optical study of charge instability in CeRu2Al10 in comparison with CeOs2Al10 and CeFe2Al10
• Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions
• Anisotropic optical conductivity of the putative Kondo insulator CeRu${}_4$Sn${}_6$
• 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
• Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (x=0 to 1): magnetic ordering emerging from the Kondo semiconducting state
• Existence of Heavy Fermions in the Antiferromagnetic Phase of CeIn3
• Electronic Structures of CeM2Al10 (M = Fe, Ru, and Os) Studied by Soft X-ray Resonant and High-Resolution Photoemission Spectroscopies
• Dispersive magnetic resonance mode in the Kondo semiconductor CeFe2Al10
• Optical Conductivity and Electronic Structure of CeRu4Sb12 under High Pressure
• Optical Evidence of Itinerant-Localized Crossover of $4f$ Electrons in Cerium Compounds
• Relation between $c$-$f$ hybridization and magnetic ordering in CeRu${}_2$Al${}_{10}$: An optical conductivity study of Ce(Ru${}_{1-x}$Rh${}_x$)${}_2$Al${}_{10}$ ($x\le 0.05$)
• Far-infrared optical conductivity of CeCu2Si2
• Doping Effects on the Electronic Structure of an Anisotropic Kondo Semiconductor CeOs${}_2$Al${}_{10}$: An Optical Study with Re and Ir Substitution
• Tuning the hybridization and magnetic ground state of electron and hole doped CeOs${}_2$Al${}_{10}$: an x-ray spectroscopy study
• CeFe${}_2$Al${}_{10}$: a Correlated Metal with a Fermi Surface Exhibiting Nonmetallic Conduction