  75As NMR experiments were performed in Ba(Fe1-xRux)2As2 for x=0 to 80%.
Magnetic fractions and NMR lineshapes demonstrate that Ru substitution destroys
the antiferromagnetic (AF) order inhomogeneously with a magnetic moment
distributed from 0.9 to 0 uB. Superconductivity emerges at intermediate Ru
doping and coexists with AF order only in the regions where moments are smaller
than ~0.3uB, resulting in an original nanoscale texture. This situation
contrasts with that of Co substitution, challenging the apparent universality
of the phase diagram in Fe-based superconductors.
