TY - JOUR
T1 - Structure and physical properties of iron-selenide KxFe2-ySe2
AU - Güler, Nilay Kantarc I.
AU - Özçelik, Bekir
AU - Ekicibil, Ahmet
AU - Onar, Kübra
AU - Yakinci, M. Eyyüphan
AU - Okazaki, H.
AU - Takeya, H.
AU - Takano, Y.
N1 - Funding Information:
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.
Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
PY - 2015/8/15
Y1 - 2015/8/15
N2 - 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.
AB - 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.
KW - Crystal growth
KW - Magnetoresistivity
KW - SEM
KW - Superconductivity
KW - X-ray differaction
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U2 - 10.1016/j.matchemphys.2015.08.037
DO - 10.1016/j.matchemphys.2015.08.037
M3 - Article
AN - SCOPUS:84941353743
VL - 164
SP - 157
EP - 162
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
ER -