Differential Conductance and Defect States in the Heavy Fermion Superconductor CeCoIn₅

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We demonstrate that the electronic bandstructure extracted from quasi-particle interference spectroscopy [Nat. Phys. 9, 468 (2013)] and the theoretically computed form of the superconducting gaps [Proc. Nat. Acad. Sci. 111, 11663 (2014)] can be used to understand the dI/dV lineshape measured in the normal and superconducting state of CeCoIn₅ [Nat. Phys. 9, 474 92103)]. In particular, the dI/dV lineshape, and the spatial structure of defect-induced impurity states, reflects the existence of multiple superconducting gaps of dₓ₂₋y₂-symmetry. These results strongly support a recently proposed microscopic origin of the unconventional superconducting state.