Superconductivity of Fe based pnictides and chalcogenides: Material aspects, doping routes, future prospects and challenges

V. P.S. Awana, Anuj Kumar, Anand Pal, Shiva Kumar, R. S. Meena, R. Jha, Jagdish Kumar, Bhasker Gahtori, H. Kishan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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 Tc is collective effect of electron doping and short range ordering of Fe spins. Whereas in Co/Ni doped samples occurrence of Tc is mainly due to electron doping. Seemingly magnetic excitations play an important role in achieving superconductivity. This along with drastic depression of Tc 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 Tc, 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 Co3d is clearly seen.

Original languageEnglish
Title of host publicationSolid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011
Number of pages4
Publication statusPublished - 2012
Event56th DAE Solid State Physics Symposium 2011 - Kattankulathur, Tamilnadu, India
Duration: 19-12-201123-12-2011

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference56th DAE Solid State Physics Symposium 2011
CityKattankulathur, Tamilnadu

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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