Heavy-Fermion Superconductivity and Localized-Itinerant Crossover in the Kondo Lattice

Junya Otsuki

doi:10.1016/j.phpro.2015.12.199

Heavy-Fermion Superconductivity and Localized-Itinerant Crossover in the Kondo Lattice

Research output: Contribution to journal › Conference article

Abstract

Superconductivity in the two-dimensional Kondo lattice model is derived by means of the dual-fermion approach. This framework takes full account of local correlations based on the dynamical mean-field theory and further includes influence of critical antiferromagnetic fluctuations. It is found that pairing with d_x2 _-y2 symmetry similar to the Hubbard model appears only in the weak-coupling regime. As the coupling is increased, we observe transition to p-wave spin-singlet superconductivity. The emergence of the unconventional p-wave pairing is ascribed to formation of large Fermi surface, which embodies itinerancy of f electrons.

Original language	English
Pages (from-to)	326-331
Number of pages	6
Journal	Physics Procedia
Volume	75
DOIs	https://doi.org/10.1016/j.phpro.2015.12.199
Publication status	Published - Jan 1 2015
Externally published	Yes
Event	20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain Duration: Jul 5 2015 → Jul 10 2015

Keywords

dual-fermion approach
dynamical mean-field theory
Kondo lattice
odd-frequency pairing

ASJC Scopus subject areas

Physics and Astronomy(all)

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Otsuki, J. (2015). Heavy-Fermion Superconductivity and Localized-Itinerant Crossover in the Kondo Lattice. Physics Procedia, 75, 326-331. https://doi.org/10.1016/j.phpro.2015.12.199

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abstract = "Superconductivity in the two-dimensional Kondo lattice model is derived by means of the dual-fermion approach. This framework takes full account of local correlations based on the dynamical mean-field theory and further includes influence of critical antiferromagnetic fluctuations. It is found that pairing with dx2 -y2 symmetry similar to the Hubbard model appears only in the weak-coupling regime. As the coupling is increased, we observe transition to p-wave spin-singlet superconductivity. The emergence of the unconventional p-wave pairing is ascribed to formation of large Fermi surface, which embodies itinerancy of f electrons.",

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AB - Superconductivity in the two-dimensional Kondo lattice model is derived by means of the dual-fermion approach. This framework takes full account of local correlations based on the dynamical mean-field theory and further includes influence of critical antiferromagnetic fluctuations. It is found that pairing with dx2 -y2 symmetry similar to the Hubbard model appears only in the weak-coupling regime. As the coupling is increased, we observe transition to p-wave spin-singlet superconductivity. The emergence of the unconventional p-wave pairing is ascribed to formation of large Fermi surface, which embodies itinerancy of f electrons.

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