Re-appearance of antiferromagnetic ordering with Zn and Ni substitution in La2-xSrxCuO4

The effects of non-magnetic Zn and magnetic Ni substitution for Cu site on magnetism are studied by measurements of uniform magnetic susceptibility for lightly doped La2-xSrxCu1-zMzO4 (M = Zn or Ni) polycrystalline samples. For the parent x = 0, Zn doping suppresses the Neel temperature T-N whereas Ni doping hardly changes T-N up to z = 0.3. For the lightly doped samples with T-N similar to 0, the Ni doping recovers T-N. For the superconducting samples, the Ni doping induces the superconductivity-to-antiferromagnetic transition (or crossover). All the heavily Ni doped samples indicate a spin glass behavior at similar to15 K. (C) 2003 Elsevier Science B.V. All rights reserved.