  While it is known that the nature and the arrangement of defects in complex
oxides have an impact on the material functionalities little is known on
control of superconductivity by oxygen interstitial organization in cuprates.
Here we report direct compelling evidence for the control of Tc, by
manipulation of the superconducting granular networks of nanoscale puddles,
made of ordered oxygen stripes, in a single crystal of YBa2Cu3O6.5+y with
average formal hole doping p close to 1/8. Upon thermal treatments we were able
to switch from a first network of oxygen defects striped puddles with OVIII
modulation (qOVIII(a*)=(h+3/8,k,0) and qOVIII(a*)=(h+5/8,k,0)), to second
network characterized by OXVI modulation (qOXVI(a*)=(h+7/16,k,0) and
qOXVI(a*)=(h+9/16,k,0)), and finally to a third network with puddles of OV
periodicity (qOV(a*)=(4/10,1,0) and qOV(a*)=(6/10,1,0)). We map the microscopic
spatial evolution of the out of plane OVIII, OXVI and OV puddles nano-size
distribution via scanning micro-diffraction measurements. In particular, we
calculated the number of oxygen chains (n) and the charge density (holes
concentration p) inside each puddle, analyzing areas of 160x80 {\mu}m2, and
recording 12800 diffraction patterns to reconstruct each spatial map. The high
spatial inhomogeneity shown by all the reconstructed spatial maps reflects the
intrinsic granular structure that characterizes cuprates and
iron-chalcogenides, disclosing the presence of several complex networks of
coexisting superconducting domains with different lattice modulations, charge
density and different gaps like in the proposed multi-gaps scenario called
superstripes.
