Título: “Defect engineered correlation between superconductivity and Fermi liquidness”

Resumo:

In Fermi liquids, the thermal evolution of the resistivity due to electron-electron interactions scales as A T^2. Below a certain transition temperature, Tc, in turn, Fermi liquids may become unstable and move towards a zero-resistivity, Cooper-paired, superconducting state. Experiments on vast classes of conventional and nonconventional superconductors have revealed such ubiquitous Fermi liquid (FL) behavior and indicate a direct connection to the superconducting transition temperature, Tc=Tc(A). Theoretical estimates of A and Tc, however, have had serious difficulties in reconciling these two observations, mostly because of the severe kinematic constraints imposed by translational invariance. Here we report a novel route to patching up Fermi liquid behavior with superconductivity: decorating these materials with amorphization defect complexes. These large complexes produce important distortions to the underlying host lattice, breaking translational invariance and softening the vibrational spectrum, which ultimately stabilises the Fermi liquid behaviour while concomitantly influencing the pairing of electrons. Confirmation examples of the relation $T_c(A)$ are drawn from a wide class of systems such as quenched A15, defect-incorporated thin films, Fe-based pnictides and chalcogenides, heavy Fermions, SrTiO$_3$-related, and others, all of which have been grouped together into four different categories in a universal plot.