Shekhar, Chandra and Singh, Sonal and Siwach, P. K. and Singh, H. K. and Srivastava, O. N. (2008) Synthesis and microstructural studies of iron oxypnictide LaO1−xFxFeAs superconductors. Superconductor Science and Technology , 22 (1). 015005-1-015005-5. ISSN 0953-2048

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Abstract

We report on the synthesis and structural/microstructural studies of iron-based fluorine doped LaOFeAs superconductors. We have successfully synthesized fluorine doped superconducting LaO1−xFxFeAs materials by choosing lower temperature (~1150 °C) and longer synthesis duration (~60 h) as compared to the standard values of these employed in the pioneering first contribution (Kamihara et al 2008 J. Am. Chem. Soc. 130 3296). A decrease of lattice parameters, as determined by x-ray diffraction, confirms the substitution of fluorine. The superconducting transition temperature is 27.5 K which is observed at a doping level of x = 0.2. This superconducting material LaO1−xFxFeAs exhibits interesting microstructural characteristics. These relate to the existence of another structural phase, besides the standard phase, having c parameters of ~12.67 Å. This suggests the existence of a modulated structure, similar to the cuprates, in these new oxypnictides. This phase may have new impact on this new high-TC family.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Institute of Physics.
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	17 Oct 2012 12:24
Last Modified:	17 Oct 2012 12:24
URI:	http://npl.csircentral.net/id/eprint/716

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