Structure And Physical Properties Of Iron-Selenide Kxfe2-Yse2
| Autor: | Nilay Kantarcı Güler, K. Onar, Bekir Özçelik, Hiroyuki Takeya, Ahmet Ekicibil, Yoshihiko Takano, Hiroyuki Okazaki, M. Eyyüphan Yakıncı |
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| Přispěvatelé: | Çukurova Üniversitesi |
| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Materials science Flux pinning 02 engineering and technology Activation energy 01 natural sciences Crystal chemistry.chemical_compound Magnetization Lattice constant Condensed Matter::Superconductivity Selenide 0103 physical sciences General Materials Science 010306 general physics Condensed matter physics Magnetoresistivity 021001 nanoscience & nanotechnology Condensed Matter Physics Magnetic field X-ray differaction chemistry SEM Crystal growth 0210 nano-technology |
| Popis: | We have synthesized the superconducting KxFe2-ySe2 (x = 0.8) crystal by using the one step technique. SEM images demonstrate terrace-like structures on the surface and the sample contains two phases. XRD pattern gives the (00l) peaks. The main peaks are indexed to the I4/m space group and the lattice parameter c is calculated to be 13.94076 Å. ZFC magnetization measurement exhibits a very sharp transition which indicates the presence of superconductivity in the crystal. The superconducting transition temperature, Tcmag, obtained from magnetization measurement is estimated to be 31 K. The critical current value, Jc(0), deduced from the M-H loops for sample is approximately 9 × 104 A/cm2 at 5 K. From magnetoresistivity measurement the Tc, Tconset and Tcoffset temperatures at the absence of the external magnetic field are found as 32.2, 33.1 K and 31.5 K, respectively. The calculated flux pinning or activation energy U is around 0.46 eV for 0 T. © 2015 Elsevier B.V. All rights reserved. FDK-2014-1915, FEF2013DP11 112T767 National Council for Scientific Research This work is supported by the Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. 112T767 and Research Fund of Cukurova University, Adana, Turkey , under grant contracts no: FDK-2014-1915 , and FEF2013DP11 . We wish to thank Dr. MasashiTanaka from National Institute for Materials Science (NIMS)-Japan for valuable discussions on BSE results. |
| Databáze: | OpenAIRE |
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