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Pairing Symmetry Model of the Novel LaNiAsO0.7 Superconductor Studied via Fe Impurity Substitution

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Abstract

LaNiAsO0.7 is a novel superconductor (T c = 4.1 K) that emerged very recently. Its pairing symmetry model was studied via Fe impurity substitution effects on the structural, magnetic, and electrical properties. The successful doping of Fe level in LaNi1−x Fe x AsO0.7 up to x = 0.05 results in a continuous suppression of T c toward zero, which however is far from that expected from a pairing-breaking effect, x = 0.0029. The results evidently exclude the d-wave model. Alternatively, they likely indicate LaNiAsO0.7 as a fully gapped isotropic s-wave or multiband superconductor. The study provides fresh insights into pairing symmetry model of LaNiAsO and hence distinguishes it from the doped LaFeAsO superconductor.

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Acknowledgments

This research was supported by the National Science Foundation (Nos 51002143 and 51072184); Aeronautical Science Foundation (Nos.2010ZF55013 and 2013ZD55006); Foundation for University Young Key Teacher by Henan Province (No. 2010GGJS-146); and Foundation for Young Teacher by ZZIA (No.2013111002).

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Authors and Affiliations

  1. Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, Henan, China

    L. M. Chen, X. Y. Zhang, Y. Zhang & R. Zhang

  2. North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou, 450011, Henan, China

    B. Xu

  3. Zhengzhou University of Light Industry, Zhengzhou, 450002, Henan, China

    Z. P. Chen

  4. Institute of Physics, Chinese Academy of Science, Beijing, 100190, China

    X. Wang

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  1. L. M. Chen
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  2. B. Xu
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  3. X. Y. Zhang
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  4. Y. Zhang
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  5. Z. P. Chen
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  6. R. Zhang
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  7. X. Wang
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Correspondence to L. M. Chen or X. Wang.

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Chen, L.M., Xu, B., Zhang, X.Y. et al. Pairing Symmetry Model of the Novel LaNiAsO0.7 Superconductor Studied via Fe Impurity Substitution. J Supercond Nov Magn 28, 2003–2008 (2015). https://doi.org/10.1007/s10948-015-2973-1

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  • DOI: https://doi.org/10.1007/s10948-015-2973-1

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