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

doi:10.1063/1.4709861

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 proceeding › Conference contribution

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 LaFeAsO_0.8 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 CeNi_0.8Bi₂ 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 RE^4f and Co^3d is clearly seen.

Original language	English
Title of host publication	Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011
Pages	8-11
Number of pages	4
Edition	1
DOIs	https://doi.org/10.1063/1.4709861
Publication status	Published - 2012
Event	56th DAE Solid State Physics Symposium 2011 - Kattankulathur, Tamilnadu, India Duration: 19-12-2011 → 23-12-2011

Publication series

Name	AIP Conference Proceedings
Number	1
Volume	1447
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	56th DAE Solid State Physics Symposium 2011
Country/Territory	India
City	Kattankulathur, Tamilnadu
Period	19-12-11 → 23-12-11

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Access to Document

10.1063/1.4709861

Cite this

Awana, V. P. S., Kumar, A., Pal, A., Kumar, S., Meena, R. S., Jha, R., Kumar, J., Gahtori, B., & Kishan, H. (2012). Superconductivity of Fe based pnictides and chalcogenides: Material aspects, doping routes, future prospects and challenges. In Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011 (1 ed., pp. 8-11). (AIP Conference Proceedings; Vol. 1447, No. 1). https://doi.org/10.1063/1.4709861

@inproceedings{606133e8894f46c3b9333a578ebba526,

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

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 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.",

author = "Awana, {V. P.S.} and Anuj Kumar and Anand Pal and Shiva Kumar and Meena, {R. S.} and R. Jha and Jagdish Kumar and Bhasker Gahtori and H. Kishan",

year = "2012",

doi = "10.1063/1.4709861",

language = "English",

isbn = "9780735410442",

series = "AIP Conference Proceedings",

number = "1",

pages = "8--11",

booktitle = "Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011",

edition = "1",

note = "56th DAE Solid State Physics Symposium 2011 ; Conference date: 19-12-2011 Through 23-12-2011",

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Awana, VPS, Kumar, A, Pal, A, Kumar, S, Meena, RS, Jha, R, Kumar, J, Gahtori, B & Kishan, H 2012, Superconductivity of Fe based pnictides and chalcogenides: Material aspects, doping routes, future prospects and challenges. in Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011. 1 edn, AIP Conference Proceedings, no. 1, vol. 1447, pp. 8-11, 56th DAE Solid State Physics Symposium 2011, Kattankulathur, Tamilnadu, India, 19-12-11. https://doi.org/10.1063/1.4709861

Superconductivity of Fe based pnictides and chalcogenides: Material aspects, doping routes, future prospects and challenges. / Awana, V. P.S.; Kumar, Anuj; Pal, Anand et al.
Solid State Physics - Proceedings of the 56th DAE Solid State Physics Symposium 2011. 1. ed. 2012. p. 8-11 (AIP Conference Proceedings; Vol. 1447, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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N2 - 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.

AB - 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.

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

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