Local suppression of the superfluid density of PuCoGa5by strong onsite disorder

Tanmoy Das, Jian-Xin Zhu, Matthias J. Graf
2011 Physical Review B  
We present superfluid density calculations for the unconventional superconductor PuCoGa_5 by solving the real-space Bogoliubov-de Gennes equations on a square lattice within the Swiss Cheese model in the presence of strong on-site disorder. We find that despite strong electronic inhomogeneity, one can establish a one-to-one correspondence between the local maps of the density of states, superconducting order parameter, and superfluid density. In this model, strong on-site impurity scattering
more » ... ches localized holes into the fabric of d-wave superconductivity similar to a Swiss cheese. Already a two-dimensional impurity concentration of n_ imp = 4 pronounced short-range suppression of the order parameter and a suppression of the superconducting transition temperature T_c by roughly 20 pure limit value T_c0, whereas the superfluid density ρ_s is reduced drastically by about 70 data for aged (400 day-old) and fresh (25 day-old) PuCoGa_5 superconducting samples. In addition, we show that the T^2-dependence of the low-T superfluid density, a signature of dirty d-wave superconductivity, originates from a combined effect in the density of states of 'gap filling' and 'gap closing'. Finally, we demonstate that the Uemuera plot of T_c vs. ρ_s deviates sharply from the conventional Abrikosov-Gor'kov theory for radiation-induced defects in PuCoGa_5, but follows the same trend of short-coherence-length high-T_c cuprate superconductors.
doi:10.1103/physrevb.84.134510 fatcat:m6utzprebzf5fkxdrzlnxngsqu