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Gap-anisotropic model for the narrow-Gap kondo insulators

Moreno1, Coleman

  • 1Department of Physics & Astronomy, Northwestern University, 2145 Sheridan Rd., Evanston, Illinois 60208, USA.

Physical Review Letters
|October 4, 2000
PubMed
Summary

This study presents a theory for the hybridization gap in Kondo insulators like CeNiSn and CeRhSb. Hund

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Kondo insulating materials exhibit unique electronic properties due to strong electron correlations.
  • Understanding the formation of hybridization gaps in these materials is crucial for their technological applications.
  • Previous models did not fully explain the nodal structure of the hybridization gap in specific cerium compounds.

Purpose of the Study:

  • To present a theoretical framework for the dynamical generation of a hybridization gap with nodes.
  • To explain the role of Hund's interactions in shaping the electronic configuration of cerium ions.
  • To elucidate the selection of a nodal Kondo semimetal state in low-symmetry crystals.

Main Methods:

  • Theoretical modeling of electronic interactions in cerium-based Kondo insulators.
  • Analysis of Hund's interactions acting on virtual 4f(2) configurations.
  • Investigation of Weiss field generation and its coupling to ionic shape.

Main Results:

  • A theory is presented that accounts for the dynamical generation of a hybridization gap with nodes.
  • Hund's interactions dynamically select the cerium ion's shape via a generated Weiss field.
  • A nodal Kondo semimetal state is identified as the lowest energy configuration in low-symmetry crystals.

Conclusions:

  • The proposed theory successfully explains the observed hybridization gap with nodes in CeNiSn and CeRhSb.
  • Dynamical selection of ionic shape through Hund's interactions is a key mechanism.
  • The findings provide a new understanding of electronic structure in correlated materials.

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