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We have systematically studied the substitution of nonmagnetic Zn andmagnetic Ni at iron sites in Ce based oxypnictide. The parent compound(CeOFeAs) shows an anomaly in resistivity around 150 K due to structuraltransition from tetragonal (space group: P4/nmm) to orthorhombic structure(space group: Cmma). Substitution of Zn suppresses this anomaly to lowertemperature (~130 K) but Ni substitution does not show any anomaly around thistemperature and the compound behaves like a metal. Further, we find that nonmagnetic (Zn) doping leads to higher impurity scattering as compared tomagnetic Ni doping. Similar to the resistivity measurement, the specific heatshows another jump near 4 K for CeOFeAs. This is attributed to the ordering ofCe3+ moments. This peak shifts to 3.8 K for Zn substituted compound and thereis no change in the ordering temperature in the Ni substituted CeOFeAs. Thesepeaks are broadened in applied magnetic field (5 T) and the calculated magneticentropy tends to saturate at the same value for 0 T and 5 T external magneticfield.

Study of Ni and Zn doped CeOFeAs: Effect on the structural transition and specific heat capacity