We report zero field and transverse field muSR measurements in magneti
c YBa2(Cu1-yZny)3Ox. Mild disorder of the antiferromagnetic state (x <
6.1), a new disordered magnetic phase above x = 6.4 where superconduc
tivity is destroyed by Zn substitution and, finally, local moments iii
the paramagnetic state are the most salient features related to Zn su
bstitution described here.