| Autor: |
de Siqueira, Franciele Nunes, Monteiro, João Frederico Haas Leandro, Jurelo, Alcione Roberto, Dias, Fábio Teixeira, Júnior, Jorge Luiz Pimentel |
| Zdroj: |
Brazilian Journal of Physics; Oct2019, Vol. 49 Issue 5, p646-653, 8p |
| Abstrakt: |
Ni substitution effects on the Fe1-xNixSe0.5Te0.5 (x = 0.00, x = 0.05, and x = 0.10) superconductor structure were studied. The polycrystalline samples were synthesized using the solid-state reaction method. The morphology of the samples consists of plate-like crystals with a lamellar structure. X-ray diffraction analyses showed that the samples are described as presenting a PbO-type structure with a tetragonal space group P4/nmm. We analyzed the chemical composition of single crystals using energy-dispersive spectroscopy, and the results showed that there are variations on the chemical composition when the Fe ions are substituted by Ni. Raman spectroscopy on ab- and a(b)c-planes revealed four phonon modes allowed by symmetry. Changes were observed in the spectra with Ni doping. From magnetic measurements of x = 0.00 and x = 0.05 samples, the results showed that the samples are superconductor with a sharp transition in temperatures TC of 14.4 K and 14.6 K, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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