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 › peer-review

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 - 2015
Externally published	Yes
Event	20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain Duration: Jul 5 2015 → Jul 10 2015

Keywords

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

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1016/j.phpro.2015.12.199

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@article{5767d89b1d6f458e87d2f5f9ab01f7d4,

title = "Heavy-Fermion Superconductivity and Localized-Itinerant Crossover in the Kondo Lattice",

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.",

keywords = "Kondo lattice, dual-fermion approach, dynamical mean-field theory, odd-frequency pairing",

author = "Junya Otsuki",

note = "Funding Information: This work was supported by JSPS KAKENHI Grant No. 26800172. Publisher Copyright: {\textcopyright} 2015 The Authors. Published by Elsevier B.V.; 20th International Conference on Magnetism, ICM 2015 ; Conference date: 05-07-2015 Through 10-07-2015",

year = "2015",

doi = "10.1016/j.phpro.2015.12.199",

language = "English",

volume = "75",

pages = "326--331",

journal = "Physics Procedia",

issn = "1875-3884",

publisher = "Elsevier BV",

}

TY - JOUR

T1 - Heavy-Fermion Superconductivity and Localized-Itinerant Crossover in the Kondo Lattice

AU - Otsuki, Junya

PY - 2015

Y1 - 2015

N2 - 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.

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.

KW - Kondo lattice

KW - dual-fermion approach

KW - dynamical mean-field theory

KW - odd-frequency pairing

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DO - 10.1016/j.phpro.2015.12.199

M3 - Conference article

AN - SCOPUS:84974715492

VL - 75

SP - 326

EP - 331

JO - Physics Procedia

JF - Physics Procedia

SN - 1875-3884

T2 - 20th International Conference on Magnetism, ICM 2015

Y2 - 5 July 2015 through 10 July 2015

ER -

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

Abstract

Keywords

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