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

被引:0
|
作者
Rayees A. Zargar
Anand Pal
A. K. Hafiz
V. P. S. Awana
机构
[1] Jamia Millia Islamia,Department of Physics
[2] National Physical Laboratory (CSIR),Quantum Phenomena and Application Division
[3] Indian Institute of Science,Department of Physics
来源
Journal of Superconductivity and Novel Magnetism | 2014年 / 27卷
关键词
Iron chalcogenide superconductors; Structural; Magnetization; Upper critical field; Thermally activated flux flow;
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摘要
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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页码:897 / 901
页数:4
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