Awana, V. P. S. and Kumar, Anuj and Pal, Anand and Kumar, Shiva and Meena, R. S. and Jha, R. and Kumar, Jagdish and Gahtori, Bhasker and Kishan, H. (2012) Superconductivity of Fe based Pnictides and chalcogenides: Material aspects, Doping routes, Future prospects and Challenges. Solid State Physics: Proceedings Of The 55th DAE Solid State Physics Symposium 2010, PTS A and B, 1147. 8-11. ISSN 0094-243X

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Abstract

I review here constant efforts of my superconducting materials group on synthesis and physical properties of title compounds from very beginning (May 2008) itself. Both direct (Fe/Co, Ni) and indirect O/F carrier doping routes are applied and superconductivity is achieved up to 14K and 50K respectively. It infers that in F doped samples the T-c is collective effect of electron doping and short range ordering of Fe spins. Whereas in Co/Ni doped samples occurrence of T-c is mainly due to electron doping. Seemingly magnetic excitations play an important role in achieving superconductivity. This along with drastic depression of T-c with Fe site Zn doping in superconducting LaFeAsO0.8 indicates towards s(+/-) coupling. Magneto transport measurements showed that these superconductors are quite robust against magnetic field having upper critical field [Hc(2)(0)] of up to 400 Tesla. It is found that though FeSe/Te superconductor possesses lower T-c, the same is even more robust against magnetic field than the REFeAsO. Several future compounds with similar structure and good promises for superconductivity including BiOCuS, doped LaCo2B2, and CeNi0.8Bi2 etc. will be discussed. It is inferred from XPS (X-ray photo electron spectroscopy) that like Cu and O hybridization in HTSc, the Fe and As in REFeAsO and Fe and Se/Te in FeSe/Te play an important role. The role of Fe will be discussed by full Fe/Co substitution viz. RECoAsO and RECoPO, where interplay of RE4f and Co-3d is clearly seen.

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Applied Physics/Condensed Matter
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:55
Last Modified:	19 Aug 2026 10:55
URI:	https://npl.csircentral.net/id/eprint/3387

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