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Structural, Electrical and Magnetic Behaviour of FeTe0.5Se0.5 Superconductor

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Abstract

We report the synthesis as well as structural and physical properties of the bulk polycrystalline FeTe and FeTe0.5Se0.5 compounds. These samples are synthesised by the solid state-reaction method via vacuum encapsulation. Both studied compounds are crystallized in a tetragonal phase with space group P4/nmm. The parent FeTe compound shows an anomaly in resistivity measurement at around 78 K, which is due to the structural change along with a magnetic phase transition. The superconductivity in the FeTe0.5Se0.5 sample at 13 K is confirmed by the resistivity measurements. DC magnetisation along with an isothermal (M–H) loop shows that FeTe0.5Se0.5 possesses bulk superconductivity. The upper critical field is estimated through resistivity ρ (T,H) measurements using Gingzburg–Landau (GL) theory and is above 50 T with 50 % resistivity drop criterion. The origin of the resistive transition broadening under magnetic field is investigated by thermally activated flux flow. The magnetic field dependence of the activation energy of the flux motion is discussed.

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Acknowledgements

The authors would like to thank their Director Prof. R.C. Budhani for his keen interest in the present work. This work was supported by DAE-SRC outstanding investigator award scheme to search for new superconductors. Anand Pal would like to thank UGC for granting Dr. D.S. Kothari a postdoctoral fellowship.

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Authors and Affiliations

  1. Department of Physics, Jamia Millia Islamia, New Delhi, 110025, India

    Rayees A. Zargar, Anand Pal & A. K. Hafiz

  2. Quantum Phenomena and Application Division, National Physical Laboratory (CSIR), Dr. K.S. Krishnan Road, New Delhi, 110012, India

    Rayees A. Zargar, Anand Pal & V. P. S. Awana

  3. Department of Physics, Indian Institute of Science, Bangalore, 560012, India

    Anand Pal

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  1. Rayees A. Zargar
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  2. Anand Pal
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Correspondence to V. P. S. Awana.

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Zargar, R.A., Pal, A., Hafiz, A.K. et al. Structural, Electrical and Magnetic Behaviour of FeTe0.5Se0.5 Superconductor. J Supercond Nov Magn 27, 897–901 (2014). https://doi.org/10.1007/s10948-014-2507-2

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  • DOI: https://doi.org/10.1007/s10948-014-2507-2

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