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Optical evidence of local and itinerant states in Ce- And Yb-heavy-fermion compounds

Optical evidence of local and itinerant states in Ce- And Yb-heavy-fermion compounds
Kimura, Shin.-IchiKwon, Yong SeungKrellner, CorneliusSichelschmidt, Jorg
Issued Date
Electronic Structure, v.3, no.2, pp.024007
Author Keywords
YbCo2Si2YbRh2Si2CeCu2Si2Heavy-fermionOptical conductivity
Low temperaturesTemperature changesTemperature dependenceTemperature variationThCr2Si2-typeYtterbium compoundsCerium compoundsCrystal structureElectron-phonon interactionsElectronic propertiesElectronic structureKondo effectOptical conductivityTemperature distributionConduction electronsHeavy fermion compoundsKondo coupling
The electronic properties of Cerium (Ce) and ytterbium (Yb) intermetallic compounds may display a more local or more itinerant character depending on the interplay of the exchange interactions among the 4f electrons and the Kondo coupling between 4f and conduction electrons. For the more itinerant case, the materials form heavy-fermions once the Kondo effect is developed at low temperatures. Hence, a temperature variation occurs in the electronic structure that can be traced by investigating the optical conductivity (σ(ω)) spectra. Remarkably, the temperature variation in the σ(ω) spectrum is still present in the more localized case, even though the Kondo effect is strongly suppressed. Here, we clarify the local and itinerant character in the electronic structure by investigating the temperature dependence in the σ(ω) spectra of various Ce and Yb compounds with a tetragonal ThCr2Si2-type crystal structure. We explain the temperature change in a unified manner. Above temperatures of about 100 K, the temperature dependence of the σ(ω) spectra is mainly due to the electron-phonon interaction, while the temperature dependence below is due to the Kondo effect. © 2021 Electronic Structure.
IOP Publishing Ltd
Related Researcher
  • 권용성 Kwon, Yong Seung 화학물리학과
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
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Department of Physics and Chemistry Quantum Functional Materials Laboratory 1. Journal Articles


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