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Optical Evidence of Itinerant- Localized Crossover of 4f Electrons in Cerium Compounds

Title
Optical Evidence of Itinerant- Localized Crossover of 4f Electrons in Cerium Compounds
Authors
Kimura, Shin-ichiKwon, Yong SeungMatsumoto, YujiAoki, HaruyoshiSakai, Osamu
DGIST Authors
Kwon, Yong Seung
Issue Date
2016-08-15
Citation
Journal of the Physical Society of Japan, 85(8)
Type
Article
Article Type
Article
ISSN
0031-9015
Abstract
Cerium (Ce)-based heavy-fermion materials have a characteristic double-peak structure (mid-IR peak) in the optical conductivity [σ(ω)] spectra originating from the strong conduction (c)-f electron hybridization. To clarify the behavior of the mid-IR peak at a low c-f hybridization strength, we compared the σ(ω) spectra of the isostructural antiferromagnetic and heavy-fermion Ce compounds with the calculated unoccupied density of states and the spectra obtained from the impurity Anderson model. With decreasing c-f hybridization intensity, the mid-IR peak shifts to the low-energy side owing to the renormalization of the unoccupied 4f state, but suddenly shifts to the high-energy side owing to the f-f on-site Coulomb interaction at a slight localized side from the quantum critical point (QCP). This finding gives us information on the change in the electronic structure across QCP. © 2016 The Physical Society of Japan.
URI
http://hdl.handle.net/20.500.11750/5084
DOI
10.7566/JPSJ.85.083702
Publisher
Physical Society of Japan
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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