Tandem Pairing in Heavy Fermion Superconductors

Details Tandem Pairing in Heavy Fermion Superconductors Tandem Pairing in Heavy Fermion Superconductors

2009-12-11

arxiv.org/abs/0912.2339v3

Phys. Rev. Lett. 105, 246404 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures; revised figures; substantially revised draft, adding discussion of NQR shift.

Scientific paper

10.1103/PhysRevLett.105.246404

We examine the internal structure of the heavy fermion condensate, showing that it necessarily involves a d-wave pair of quasiparticles on neighboring lattice sites, condensed in tandem with a composite pair of electrons bound to a local moment, within a single unit cell. These two components draw upon the antiferromagnetic and Kondo interactions to cooperatively enhance the superconducting transition temperature. The tandem condensate is electrostatically active, with a small electric quadrupole moment coupling to strain that is predicted to lead to a superconducting shift in the NQR frequency.

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