Composite pairing in a mixed valent two channel Anderson model

Abstract

Using a two-channel Anderson model, we develop a theory of composite pairing in the 115 family of heavy fermion superconductors that incorporates the effects of f-electron valence fluctuations. Our calculations introduce "symplectic Hubbard operators": an extension of the slave boson Hubbard operators that preserves both spin rotation and time-reversal symmetry in a large N expansion, permitting a unified treatment of anisotropic singlet pairing and valence fluctuations. We find that the development of composite pairing in the presence of valence fluctuations manifests itself as a phase-coherent mixing of the empty and doubly occupied configurations of the mixed valent ion. This effect redistributes the f-electron charge within the unit cell. Our theory predicts a sharp superconducting shift in the nuclear quadrupole resonance frequency associated with this redistribution. We calculate the magnitude and sign of the predicted shift expected in CeCoIn_5.

13 pages, 5 figures

References in corpus (5)

• Heavy electrons and the symplectic symmetry of spin
• Supplementary material to Heavy electrons and the symplectic symmetry of spin
• Crystal-field and Kondo scale investigation of CeMIn5 (M=Co, Ir and Rh): a combined x-ray absorption and inelastic neutron study
• Incoherent non-Fermi liquid scattering in a Kondo lattice
• Electronic inhomogeneity in a Kondo lattice

Cited by in corpus (20)

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• Direct Evidence for a Magnetic f-electron Mediated Cooper Pairing Mechanism of Heavy Fermion Superconductivity in CeCoIn5
• Superconductivity of Composite Particles in Two-Channel Kondo Lattice
• Triplet pairing mechanisms from Hund's-Kondo models: applications to UTe${}_2$ and CeRh${}_2$As${}_2$
• Mean-field description of odd-frequency superconductivity with staggered ordering vector
• Yb Valence Change in (Ce,Yb)CoIn5 from spectroscopy and bulk properties
• Molecular Pairing and Fully-Gapped Superconductivity in Yb doped CeCoIn5
• Unconventional full-gap superconductivity in Kondo lattice with semi-metallic conduction bands
• Symplectic large-N theory of topological heavy-fermion semiconductors
• Thermal Expansion of the Heavy-fermion Superconductor PuCoGa${}_5$
• Giant overlap between the magnetic and superconducting phases of CeAu2Si2 under pressure
• Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV${}_3$Sb${}_5$
• Microscopic Properties of the Heavy-Fermion Superconductor PuCoIn${}_5$ Explored by Nuclear Quadrupole Resonance
• The symplectic-N t-J model and s${}_{\pm }$ superconductors
• Extended Nuclear Quadrupole Resonance Study of the Heavy-Fermion Superconductor PuCoGa${}_5$
• Spins, electrons and broken symmetries: realizations of two channel Kondo physics
• Novel attractive pairing interaction in strongly correlated superconductors
• Theory of $(s+id)$ pairing in mixed-valent correlated metals
• Quantum criticality and superconducting pairing in Ce(1-x)Yb(x)CoIn5 alloys
• Topological ground state degeneracy of the two-channel Kondo lattice