Composite pairing in a mixed valent two channel Anderson model

Details Composite pairing in a mixed valent two channel Anderson model Composite pairing in a mixed valent two channel Anderson model

2011-03-08

arxiv.org/abs/1103.1550v2

Phys. Rev. B 84, 064514 (2011)

Physics

Condensed Matter

Superconductivity

13 pages, 5 figures

Scientific paper

10.1103/PhysRevB.84.064514

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.

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