Unconventional Superconductivity from Local Spin Fluctuations in the Kondo Lattice

Abstract

The explanation of heavy-fermion superconductivity is a long-standing challenge to theory. It is commonly thought to be connected to non-local fluctuations of either spin or charge degrees of freedom and therefore of unconventional type. Here we present results for the Kondo-lattice model, a paradigmatic model to describe heavy-fermion compounds, obtained from dynamical mean-field theory which captures local correlation effects only. Unexpectedly, we find robust s-wave superconductivity in the heavy-fermion state. We argue that this novel type of pairing is tightly connected to the formation of heavy quasiparticle bands and the presence of strong local spin fluctuations.

4.5+3 pages, 5+1 figures, supplemental material included

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Cited by in corpus (31)

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• Variational Monte Carlo approach to the two-dimensional Kondo lattice model
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• Large and Small Fermi-Surface Spin Density Waves in the Kondo Lattice Model
• Generalization of the Time-Dependent Numerical Renormalization Group Method to Finite Temperatures and General Pulses
• Competing d-Wave and p-Wave Spin-Singlet Superconductivities in the Two-Dimensional Kondo Lattice
• Superconductivity in the two-band Hubbard model
• Rotational symmetry breaking in superconducting nickelate Nd0.8Sr0.2NiO2 films
• Self-doping and the Mott-Kondo scenario for infinite-layer nickelate superconductors
• d-wave superconductivity in the frustrated two-dimensional periodic Anderson model
• Correlation-driven multigap d-wave superconductivity in Anderson lattice model
• Variational cluster approach to s-wave pairing in heavy-fermion superconductors
• Stability of the Superfluid State in Three-Component Fermionic Optical Lattice Systems
• Quantum impurities in channel mixing baths
• Plain $s$-wave superconductivity near the magnetic criticality: Enhancement of attractive electron-boson coupling vertex corrections
• Spin-triplet paired phases inside ferromagnet induced by Hund's rule coupling and electronic correlations: Application to ${\mathrm{UGe}}_2$
• Variational cluster approach to superconductivity and magnetism in the Kondo lattice model
• Pairing symmetry of heavy fermion superconductivity in the two-dimensional Kondo-Heisenberg lattice model
• Fine structure of spectra in the antiferromagnetic phase of the Kondo lattice model
• A mean-field approach to Kondo-attractive-Hubbard model
• Superconducting Kondo phase in an orbitally-separated bilayer
• Superconducting Correlations in the One-Dimensional Kondo Lattice Models under Magnetic Fields
• Interplay between charge, magnetic and superconducting order in a Kondo lattice with an attractive Hubbard interaction
• Novel attractive pairing interaction in strongly correlated superconductors
• Many-body Chern insulator in the Kondo lattice model on a triangular lattice
• Controlled pairing symmetry of the superfluid state in systems of three-component repulsive fermionic atoms in optical lattices
• Ferromagnetism in the one-dimensional Kondo lattice: mean-field approach via Majorana fermion canonical transformation
• Reentrant $s$-wave superconductivity in the periodic Anderson model with attractive conduction band Hubbard interaction
• Partial Kondo Screening and Anomalous Thermal Conductance
• Evolution of the Andreev bands in the half-filled superconducting periodic Anderson model