Pairing by Kondo interaction and magnetic phases in the Anderson-Kondo lattice model: Statistically consistent renormalized mean-field theory

We start from the Anderson–Kondo lattice model derived by us earlier, in which both the Kondo interaction and the residual hybridization processes have been included in a systematic manner. In the present work we discuss a fairly complete phase diagram including magnetic, pure superconducting (SC),...

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Bibliographic Details
Published in:Physica Status Solidi. B: Basic Solid State Physics 2013-03, Vol.250 (3), p.609-614
Main Authors: Howczak, O., Kaczmarczyk, J., Spałek, J.
Format: Article
Language:English
Subjects:
Antiferromagnetism
heavy fermions
Kondo screening
Lattices
Magnetic moment
Phase diagrams
Phases
Solid state physics
Superconductivity
unconventional superconductivity
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Summary:We start from the Anderson–Kondo lattice model derived by us earlier, in which both the Kondo interaction and the residual hybridization processes have been included in a systematic manner. In the present work we discuss a fairly complete phase diagram including magnetic, pure superconducting (SC), and coexistent antiferromagnetic (AF)–SC phases. Both intra‐ and interatomic hybridization cases have been considered, separately. The Kondo insulating state with completely compensated magnetic moments has been obtained as a reference state, from which either AF or SC or mixed AF + SC phases evolve when the metallic state becomes stable. The SC pairing is induced mainly by the Kondo interaction. The method of approach we use is the so‐called statistically consistent renormalized mean‐field theory (SC‐RMFT), encompassing essential corrections to the standard Gutzwiller‐ansatz approach.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.201200774