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Enhancement of Superconductivity in Quenched α-FeSe Flakes

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Abstract

Tetragonal α-FeSe flakes were fabricated by a simple method. Enhancement of superconductivity was observed in the quenched samples. The properties were characterized by X-ray diffraction, a superconductivity quantum interference device, and physical property measurement system. It is interesting that the superconducting transition temperature of the quenched samples is about 2 K higher than that of unquenched samples, but after reannealed, the enhancement of superconductivity disappeared. The reduction of the c/a ratio might be responsible for the enhancement of superconductivity in the quenched FeSe flakes.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 10974019, 51172029, and 91121012), the Fundamental Research Funds for the Central Universities, and the Ministry of Science and Technology of China (Grant No. 2013CB921701). This work was also supported by the Chinese–Romanian Intergovernmental S&T Cooperation Programme (Project No. CH-40-12/2010).

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Authors and Affiliations

  1. Department of Physics, Beijing Normal University, Beijing, 100875, P.R. China

    P. H. Zhao, W. Yan, Y. L. Han, S. C. Shen & J. C. Nie

  2. College of Science, China University of Petroleum, Qingdao, Shandong, 266580, P.R. China

    P. H. Zhao

  3. National Institute of Materials Physics, Atomistilor 105bis, Magurele, Ilfov, 077125, Romania

    G. Aldica, V. Sandu & P. Badica

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  1. P. H. Zhao
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  2. W. Yan
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  3. Y. L. Han
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  4. S. C. Shen
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  5. G. Aldica
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  6. V. Sandu
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  7. P. Badica
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  8. J. C. Nie
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Correspondence to J. C. Nie.

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Zhao, P.H., Yan, W., Han, Y.L. et al. Enhancement of Superconductivity in Quenched α-FeSe Flakes. J Supercond Nov Magn 26, 3349–3353 (2013). https://doi.org/10.1007/s10948-013-2194-4

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  • DOI: https://doi.org/10.1007/s10948-013-2194-4

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