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The Bardeen-Cooper-Schrieffer mechanism for superconductivity is a triumph ofthe theory of many-body systems. Implicit in its formulation is the existenceof long-lived (quasi)particles, originating from the electronic building blocksof the materials, which interact to form Cooper pairs that move coherently inlock-step. The challenge of unconventional superconductors is that it is notonly unclear what the nature of the interactions are, but whether the familiarquasi-particles that form a superconducting condensate even exist. In thiswork, we reveal, by the study of applied magnetic field in electronicallydiluted materials, that the metallic properties of the unconventionalsuperconductor CeCoIn$_5$ are determined by the degree of quantum entanglementthat (Kondo) hybridizes local and itinerant electrons. This work suggests thatthe properties of the strange metallic state are a reflection of thedisentanglement of the many-body state into the underlying electronic buildingblocks of the system itself.

Equivalence of magnetic field and particle dilution in the strange metal state of CeCoIn$_5$