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Evolution of superconductivity in PrFe1-xCoxAsO (x=0.0-1.0)

Rani, Poonam and Pal, Anand and Awana, VPS (2014) Evolution of superconductivity in PrFe1-xCoxAsO (x=0.0-1.0). In: SOLID STATE COMMUNICATIONS, 187 . pp. 5-9.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2014.02.006

Abstract

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. (C) 2014 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: copyright for this article belongs to PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords: Fe based pnicticles; Solid state synthesis; Superconductivity; Magneto-transport
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 12 Jun 2014 09:05
Last Modified: 12 Jun 2014 09:05
URI: http://eprints.iisc.ac.in/id/eprint/49159

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