Quasiparticle Interactions for f2-Impurity Anderson Model with Crystalline-Electric-Field: Numerical Renormalization Group Study

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  • Hattori Kazumasa
    Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Yotsuhashi Satoshi
    Correlated Electron Research Center, the National Institute of Advanced Industrial Science and Technology Advanced Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Miyake Kazumasa
    Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University

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  • Quasiparticle Interactions for f<sup>2</sup>-Impurity Anderson Model with Crystalline-Electric-Field: Numerical Renormalization Group Study

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Abstract

The aspect of the quasiparticle interaction of a local Fermi liquid, the impurity version of f2-based heavy fermions, is studied by the Wilson numerical renormalization group method. In particular, the case of the f2-singlet crystalline-electric-field ground state is investigated assuming the case of UPt3 with the hexagonal symmetry. It is found that the interorbital interaction becomes larger than the intraorbital one in contrast to the case of the bare Coulomb interaction for the parameters relevant to UPt3. This result offers us a basis to construct a microscopic theory of the superconductivity of UPt3 where the interorbital interactions are expected to play important roles.

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