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Hybridization gap in heavy fermion compounds.

S V Dordevic1, D N Basov, N R Dilley

  • 1Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.

Physical Review Letters
|February 15, 2001
PubMed
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New heavy fermion compounds like YbFe4Sb12 and CeRu4Sb12 exhibit a universal scaling law. This relationship connects quasiparticle effective mass and energy gap, supporting the hybridization model of f-electron and free carrier states.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Heavy fermion materials are characterized by strongly correlated electrons.
  • Understanding the interplay between localized f-electrons and conduction electrons is crucial for heavy fermion physics.

Purpose of the Study:

  • To investigate the optical properties of novel heavy fermion compounds YbFe4Sb12 and CeRu4Sb12.
  • To explore the relationship between quasiparticle effective mass and energy gap in these materials.

Main Methods:

  • Optical studies were performed on YbFe4Sb12 and CeRu4Sb12.
  • Analysis focused on identifying scaling relationships in heavy fermion systems.

Main Results:

  • A universal scaling relationship was observed between quasiparticle effective mass (m*) and energy gap (Delta) in YbFe4Sb12 and CeRu4Sb12.

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  • This relationship holds for other heavy fermion materials with nonmagnetic ground states.
  • The findings support the hybridization model.

    • Conclusions:

    • The observed universal scaling provides strong evidence for the hybridization of localized f-electron and free carrier states in heavy fermion compounds.
    • This finding offers a unifying principle for understanding the electronic properties of a range of heavy fermion materials.