Spin-dependent mass enhancement under a magnetic field in the periodic Anderson model

Seiichiro Onari, Hiroshi Kontani, Yukio Tanaka

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    15 Citations (Scopus)

    Abstract

    In order to study the mechanism underlying the mass enhancement in heavy-fermion compounds in the presence of a magnetic field, we study the periodic Anderson model by using the fluctuation exchange approximation. The resulting mass enhancement factor can have a value up to 10, which is significantly larger than that in the single-band Hubbard model. We show that the difference between the magnitude of the mass enhancement factor of up-spin (minority spin) electrons z-1 and that of down-spin (majority spin) electrons z-1 increases with the applied magnetic field B ∥ z, which is consistent with the de Haas-van Alphen measurements for CeCoIn5, CeRu2Si2, and CePd2Si2. We predict that z-1 > z-1 in many Ce compounds, whereas z -1 < z-1 in Yb compounds.

    Original languageEnglish
    Article number023703
    Journaljournal of the physical society of japan
    Volume77
    Issue number2
    DOIs
    Publication statusPublished - Feb 2008

    Keywords

    • CeCoIn
    • FLEX
    • Periodic Anderson model

    ASJC Scopus subject areas

    • General Physics and Astronomy

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