Singh, S. J. and Prakash, Jai and Pal, A. and Patnaik, S. and Awana, V. P. S. and Ganguli, A. K. (2013) Study of Ni and Zn doped CeOFeAs: Effect on the structural transition and specific heat capacity. Physica C: Superconductivity, 490. pp. 49-54. ISSN 0921-4534

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We have systematically studied the substitution of nonmagnetic Zn and magnetic Ni at iron sites in Ce based oxypnictide. The parent compound (CeOFeAs) shows an anomaly in resistivity around 150 K due to structural transition from tetragonal (space group: P4/nmm) to orthorhombic structure (space group: Cmma). Substitution of Zn suppresses this anomaly to lower temperature (similar to 130 K) but Ni substitution does not show any anomaly around this temperature and the compound behaves like a metal. Further, we find that non magnetic (Zn) doping leads to higher impurity scattering as compared to magnetic Ni doping. Similar to the resistivity measurement, the specific heat shows another jump near 4 K for CeOFeAs. This is attributed to the ordering of Ce3+ moments. This peak shifts to 3.8 K for Zn substituted compound and there is no change in the ordering temperature in the Ni substituted CeOFeAs. These peaks are broadened in applied magnetic field (5 T) and the calculated magnetic entropy tends to saturate at the same value for 0 T and 5 T external magnetic field.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Elsevier.
Subjects: Applied Physics/Condensed Matter
Depositing User: Users 27 not found.
Date Deposited: 03 Jun 2020 11:14
Last Modified: 03 Jun 2020 11:14

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