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

Zargar, Rayees A and Pal, Anand and Hafiz, AK and Awana, VPS (2014) Structural, Electrical and Magnetic Behaviour of FeTe0.5Se0.5 Superconductor. In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, 27 (4). pp. 897-901.

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Official URL: http://dx.doi.org/10.1007/s10948-014-2507-2

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 rho (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.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the SPRINGER, USA
Keywords: Iron chalcogenide superconductors; Structural; Magnetization; Upper critical field; Thermally activated flux flow
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Depositing User: Id for Latest eprints
Date Deposited: 16 May 2014 12:15
Last Modified: 16 May 2014 12:15
URI: http://eprints.iisc.ac.in/id/eprint/49063

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