Rani, Poonam and Pal, Anand and Awana, V. P. S. (2014) Evolution of superconductivity in PrFe1-xCoxAsO (x=0.0-1.0). Solid State Communications, 187. pp. 5-9. ISSN 0038-1098

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We report the synthesis and physical property characterization of Prfe(1-x)Co(x)AsO (x=0.0-1.0). The studied samples are synthesized by through the solid state reaction route via the vacuum encapsulation method. The pristine compound PrFeAsO does not show superconductivity, but rather exhibits a metallic step like transition due to spin density wave (SOW) ordering of Fe moments (Fe-SDW) below 150 K, Followed by another upward step due to anomalous ordering of Pr moments (Pr-TN) at 12 K. Both the Fe-SDW and Pr-TN temperatures decrease monotonically with Co substitution at Fe site Superconductivity appears in a narrow range of x from 0.07 to 0.25 with maximum T-c at 11.12 K for x=0.15. Samples with x >= 0.25 exhibit metallic behavior right from 300 K down to 2 K, without any Fe-SDW or Pr-TN steps in resistivity. In fact, though Fe-SDW decreases monotonically, the pr(TN) disappeared even with x=0.02. The magneto transport measurements below 14 Ton superconducting polycrystalline Co doped Pi FeAs0 lead to extrapolated values of the upper critical fields [H-c2(0)] of up to 60 T.

Item Type: Article
Additional Information: Copyright for this article belongs to M/S Elsevier.
Uncontrolled Keywords: Febasedpnictides Solidstatesynthesis Superconductivity Magneto-transport
Subjects: Physics
Depositing User: Dr. Rajpal Walke
Date Deposited: 01 Oct 2015 06:34
Last Modified: 01 Oct 2015 06:34
URI: http://npl.csircentral.net/id/eprint/1293

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