Microwave and static conductivity of cobalt doped Y1BA2CU3O7−δ in the normal state

Evidence for superconducting fluctuations at 180 K: influence of Zn, Fe and Co doping on the phonon renormalization of YBa2Cu3O7- delta

“…It is known (from neutron diffraction, E m s , Mossbauer spectroscopic studies etc) that Fe and CO substitute for copper ions preferentially on Cu(1) whereas divalent Zn tends to occupy both Cu (2) and Cu(1) sites ([ 9,[20][21][22][23][24][25][26] and references therein). The Fe-and Co-doped compounds undergo an orthorhombic to tetragonaI Structural phase transition at I re2.5%-in a similar fashion to the removal of oxygen at 6 re 0.5 in the undoped compound-whilst the Zn compounds do not.…”