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Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments

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Abstract

We present the fabrication of FeSe0.5Te0.5 polycrystalline samples by self-flux method, showing the presence of the peak-effect in the vortex lattice configuration. To improve the performances at high magnetic fields for this iron-based superconductor of the 11-family, the two-step solid-state reaction process has been successfully modified by increasing the temperature of the heat treatment and by slowing down the cooling rate. The magnetic field-temperature phase diagram has been investigated by magneto-resistance, magnetization, and heat capacity measurements in applied magnetic fields up to 18 T. The magnetization curves exhibit an enhancement of the peak-effect whose position shifts by varying the temperature, following a similar dependence than that previously reported in high-temperature superconducting materials such as YBa2Cu3O7-δ. The presence of the peak-effect can be correlated to the sample manufacture, since by tuning a proper heat treatment it becomes observable ever more in the magnetic field-temperature phase diagram. This fabrication route paves the way to a systematic increase in the critical current density thus becoming relevant for applications.

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Acknowledgements

This work was supported by the PON Research and Competitiveness 2007-2013 under Grants PON Nafassy—PONa3_00007.

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Authors and Affiliations

  1. Dipartimento di Fisica ‘E. R. Caianiello’, Università di Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano, SA, Italy

    C. Fiamozzi Zignani, A. Leo, A. Galluzzi, A. Nigro, M. Polichetti & S. Pace

  2. ENEA for EUROfusion, Via Enrico Fermi 45, 00044, Frascati, RM, Italy

    C. Fiamozzi Zignani, G. De Marzi, V. Corato, A. Mancini, A. Vannozzi, A. Rufoloni & A. della Corte

  3. CNR-SPIN, c/o Università di Salerno, Via Giovanni Paolo II, 132, 84084, Fisciano, SA, Italy

    A. Leo, A. Guarino & G. Grimaldi

Authors
  1. C. Fiamozzi Zignani
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  2. G. De Marzi
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  3. V. Corato
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  4. A. Mancini
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  5. A. Vannozzi
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  6. A. Rufoloni
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  7. A. Leo
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  8. A. Guarino
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  9. A. Galluzzi
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  10. A. Nigro
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  11. M. Polichetti
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  13. S. Pace
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  14. G. Grimaldi
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Correspondence to G. Grimaldi.

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Fiamozzi Zignani, C., De Marzi, G., Corato, V. et al. Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments. J Mater Sci 54, 5092–5100 (2019). https://doi.org/10.1007/s10853-018-03218-5

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  • DOI: https://doi.org/10.1007/s10853-018-03218-5

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