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Molecular pairing and fully gapped superconductivity in Yb-doped CeCoIn(5)
Onur Erten1, Rebecca Flint2, Piers Coleman3
1Center for Materials Theory, Rutgers University, Piscataway, New Jersey 08854, USA.
Abstract:
The recent observation of fully gapped superconductivity in Yb doped CeCoIn_{5} poses a paradox, for the disappearance of nodes suggests that they are accidental, yet d-wave symmetry with protected nodes is well established by experiment. Here, we show that composite pairing provides a natural resolution: in this scenario, Yb doping drives a Lifshitz transition of the nodal Fermi surface, forming a fully gapped d-wave molecular superfluid of composite pairs. The T^{4} dependence of the penetration depth associated with the sound mode of this condensate is in accordance with observation.
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