Unusual doping dependence of superconductivity in Nay FeAs

K. Sasmal; B. Lv; Z. J. Tang; F. Chen; Y. Y. Xue; B. Lorenz; A. M. Guloy; C. W. Chu

doi:10.1103/PhysRevB.79.184516

Unusual doping dependence of superconductivity in Nay FeAs

K. Sasmal, B. Lv, Z. J. Tang, F. Chen, Y. Y. Xue, B. Lorenz, A. M. Guloy, C. W. Chu

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Abstract

Superconductivity and phase relationships were explored in the Na-Fe-As system. The PbFCl-type 111 phase is stable only within a Na stoichiometry range of 1.00 to ∼0.85, and exhibits bulk superconductivity within an even narrower range around 0.90 in Na0.9 FeAs. In particular, stoichiometric NaFeAs is not a bulk superconductor. The onset of the superconducting transition varies in a totally different way and the highest Tc occurs in multiphase samples with a nominal composition of Na:Fe:As=0.5:1:1, where the superconductive volume-fraction is almost zero. Such doping dependency is rather surprising and in disagreement with most expectations.

Original language	English
Article number	184516
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	79
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.79.184516
Publication status	Published - 2009 May 18

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.79.184516

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title = "Unusual doping dependence of superconductivity in Nay FeAs",

abstract = "Superconductivity and phase relationships were explored in the Na-Fe-As system. The PbFCl-type 111 phase is stable only within a Na stoichiometry range of 1.00 to ∼0.85, and exhibits bulk superconductivity within an even narrower range around 0.90 in Na0.9 FeAs. In particular, stoichiometric NaFeAs is not a bulk superconductor. The onset of the superconducting transition varies in a totally different way and the highest Tc occurs in multiphase samples with a nominal composition of Na:Fe:As=0.5:1:1, where the superconductive volume-fraction is almost zero. Such doping dependency is rather surprising and in disagreement with most expectations.",

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AU - Sasmal, K.

AU - Lv, B.

AU - Tang, Z. J.

AU - Chen, F.

AU - Xue, Y. Y.

AU - Lorenz, B.

AU - Guloy, A. M.

AU - Chu, C. W.

PY - 2009/5/18

Y1 - 2009/5/18

N2 - Superconductivity and phase relationships were explored in the Na-Fe-As system. The PbFCl-type 111 phase is stable only within a Na stoichiometry range of 1.00 to ∼0.85, and exhibits bulk superconductivity within an even narrower range around 0.90 in Na0.9 FeAs. In particular, stoichiometric NaFeAs is not a bulk superconductor. The onset of the superconducting transition varies in a totally different way and the highest Tc occurs in multiphase samples with a nominal composition of Na:Fe:As=0.5:1:1, where the superconductive volume-fraction is almost zero. Such doping dependency is rather surprising and in disagreement with most expectations.

AB - Superconductivity and phase relationships were explored in the Na-Fe-As system. The PbFCl-type 111 phase is stable only within a Na stoichiometry range of 1.00 to ∼0.85, and exhibits bulk superconductivity within an even narrower range around 0.90 in Na0.9 FeAs. In particular, stoichiometric NaFeAs is not a bulk superconductor. The onset of the superconducting transition varies in a totally different way and the highest Tc occurs in multiphase samples with a nominal composition of Na:Fe:As=0.5:1:1, where the superconductive volume-fraction is almost zero. Such doping dependency is rather surprising and in disagreement with most expectations.

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Unusual doping dependence of superconductivity in Nay FeAs

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