Effect of Cooling Rate on Structure, Composition, and Superconducting Properties of FeTe0.6Se0.4 Prepared by Self-Flux Technique

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• 作者：Mehmet Gürsul ; Ahmet Ekicibil…
• 关键词：Iron ; based superconductors ; SEM ; XRD ; Self ; flux method ; Magnetization ; Magnetic hysteresis
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：29
• 期：5
• 页码：1187-1192
• 全文大小：1,294 KB
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• 作者单位：Mehmet Gürsul (1)
  Ahmet Ekicibil (1)
  Nilay Kantarcı Güler (1)
  Bekir Özçelik (1)
  
  1. Department of Physics, Faculty of Sciences and Letters, Çukurova University, 01330, Adana, Turkey
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Superconductivity, Superfluidity and Quantum Fluids
  Magnetism and Magnetic Materials
  Condensed Matter
  Characterization and Evaluation Materials
  
• 出版者：Springer New York
• ISSN：1557-1947

文摘

We have reported the synthesis and characterization of FeTe_0.6Se_0.4 prepared by self-flux technique with two different cooling rates, namely 0.8 and 4.5∘C/h. The effect of cooling rate on the samples has been characterized by using scanning electron microscopy (SEM) together with energy dispersive X-ray (EDX) spectrometer, X-ray diffraction (XRD), magnetization and magnetic hysteresis techniques. Four strong peaks were observed in the powder XRD patterns of both samples corresponding to the reflected intensities from the (001), (002), (003), and (004) planes of the tetragonal structure having space group P4/nmm. However, sample 2 has extra peaks corresponding to various non-superconducting binary phases of FeSe and FeTe. It can be concluded that the multiphase behavior of system increases with increasing cooling rate. The critical current value at 5 K, J _c (0), deduced from the M − H loops is approximately 5.6 × 104 A/cm2 for sample 1 and 7.5 × 104 A/cm2 for sample 2. Increasing in the critical current value can be attributed to non-superconducting binary phases acting as effective pinning centers in the system.