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Effect of Ni and Zn substitution on magnetic properties of the high- T c superconductor GdBa <…

1990; American Physical Society; Volume: 42; Issue: 4 Linguagem: Inglês

10.1103/physrevb.42.2554

1095-3795

Chin Lin, Zun-Xiao Liu, Jian Lan,

Magnetic and transport properties of perovskites and related materials

Magnetic properties of ${\mathrm{GdBa}}_{2}$(${\mathrm{Cu}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathit{M}}_{\mathit{x}}$${)}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathit{y}}$ were studied with M=Ni, Zn and x=0, 0.025, 0.050, 0.075, and 0.100. All samples are single phase with orthorhombic oxygen-deficient perovskite structure. Substitution of Cu by Ni or Zn not only depresses superconductivity but also reduces the antiferromagnetic ordering temperature ${\mathit{T}}_{\mathit{N}}$ of Gd ions, suggesting an interaction between Gd ions and the Cu-O plane. The effect of Ni on ${\mathit{T}}_{\mathit{N}}$ is the same as that of Zn. For x=0.10, both Ni- and Zn-substituted compounds are nonsuperconducting. A deviation from Curie-Weiss behavior is observed at about 8 K for these nonsuperconducting compounds. A possible explanation is discussed.