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

  • C. Fiamozzi Zignani
  • G. De Marzi
  • V. Corato
  • A. Mancini
  • A. Vannozzi
  • A. Rufoloni
  • A. Leo
  • A. Guarino
  • A. Galluzzi
  • A. Nigro
  • M. Polichetti
  • A. della Corte
  • S. Pace
  • G. Grimaldi
Metals
  • 16 Downloads

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.

Notes

Acknowledgements

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

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • C. Fiamozzi Zignani
    • 1
    • 2
  • G. De Marzi
    • 2
  • V. Corato
    • 2
  • A. Mancini
    • 2
  • A. Vannozzi
    • 2
  • A. Rufoloni
    • 2
  • A. Leo
    • 1
    • 3
  • A. Guarino
    • 3
  • A. Galluzzi
    • 1
  • A. Nigro
    • 1
  • M. Polichetti
    • 1
  • A. della Corte
    • 2
  • S. Pace
    • 1
  • G. Grimaldi
    • 3
  1. 1.Dipartimento di Fisica ‘E. R. Caianiello’Università di SalernoFiscianoItaly
  2. 2.ENEA for EUROfusionFrascatiItaly
  3. 3.CNR-SPIN, c/o Università di SalernoFiscianoItaly

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