Similarity between Ni and Zn impurity effects on the superconductivity   and Cu-spin correlation in La2-xSrxCu1-yNiyO4 high-Tc cuprates: A comparison   based on the hole trapping by Ni
  Ni-substitution effects on the superconductivity and Cu-spin correlation have been investigated in La2-xSrxCu1-yNiyO4 from the electrical resistivity and muon spin relaxation measurements, taking into account the hole trapping by Ni recently suggested. It has been found that the Ni-substitution suppresses the superconductivity, induces the localization of holes and develops the Cu-spin correlation to the same degree as the Zn substitution. These suggest that Ni with a trapped hole tends to give rise to potential scattering of holes in the CuO2 plane to the same degree as Zn, being discussed in relation to the so-called dynamical stripe correlations of spins and holes. 
Y. Tanabe, T. Adachi, K. Suzuki, T. Kawamata, Risdiana, T. Suzuki, I.   Watanabe, Y. Koike
cond-mat.supr-con cond-mat.str-el