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Interplay between unconventional superconductivity and heavy-fermion quantum criticality: CeCu<sub>2</sub>Si<sub>2</sub>versus YbRh<sub>2</sub>Si<sub>2</sub>
In this paper the low-temperature properties of two isostructural canonical heavy-fermion compounds are contrasted with regards to the interplay between antiferromagnetic (AF) quantum criticality and superconductivity. For CeCu$_2$Si$_2$, fully-gapped d-wave superconductivity forms in the vicinity of an itinerant three-dimensional heavy-fermion spin-density-wave (SDW) quantum critical point (QCP). Inelastic neutron scattering results …