Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors

Keisuke Masuda, Daisuke Yamamoto

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Cooper pairing between a conduction electron (c electron) and an f electron, referred to as the "c-f pairing," is examined to explain s-wave superconductivity in heavy-fermion systems. We first apply the Schrieffer-Wolff transformation to the periodic Anderson model assuming deep f level and strong Coulomb repulsion. The resulting effective Hamiltonian contains direct and spin-exchange interactions between c and f electrons, which are responsible for the formation of the c-f Cooper pairs. The mean-field analysis shows that the fully gapped c-f pairing phase with anisotropic s-wave symmetry appears in a large region of the phase diagram. We also find two different types of exotic c-f pairing phases, the Fulde-Ferrell and breached pairing phases. The formation of the c-f Cooper pairs is attributed to the fact that the strong Coulomb repulsion makes a quasiparticle f band near the center of the conduction band.

Original languageEnglish
Article number014516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number1
DOIs
Publication statusPublished - 2013 Jan 31

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Heavy fermion superconductors
heavy fermion superconductors
conduction electrons
heavy fermion systems
Electrons
spin exchange
Hamiltonians
conduction bands
electrons
superconductivity
Fermions
Exchange interactions
phase diagrams
Superconductivity
Conduction bands
Phase diagrams
symmetry
interactions

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors. / Masuda, Keisuke; Yamamoto, Daisuke.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 87, No. 1, 014516, 31.01.2013.

Research output: Contribution to journalArticle

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