Molecular Pairing and Fully Gapped Superconductivity in Yb-doped CeCoIn5

Onur Erten; Rebecca Flint; Piers Coleman

doi:10.1103/PhysRevLett.114.027002

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Molecular Pairing and Fully Gapped Superconductivity in Yb-doped CeCoIn5

Onur Erten, Rebecca Flint, Piers Coleman

DOI 10.1103/PhysRevLett.114.027002 · Physical Review Letters

T1

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Abstract

The recent observation of fully gapped superconductivity in Yb doped CeCoIn5 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 T4 dependence of the penetration depth associated with the sound mode of this condensate is in accordance with observation.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	unknown