Magnetization Measurements at High Temperature on Highly Oriented FeSe0.5Te0.5 Superconductor

• Published in: Journal of superconductivity and novel magnetism 2017, Vol.30 (7), p.1699-1704
• Main Authors: Silva, Karciano J. S., Landinez Tellez, D. A., Parra Vargas, C. A., Buitrago, D. Martinez, Passos, C. A. C., Capucho, I. M., Pinto, J. N. O., Abílio, V. T., Aguiar, J. Albino
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Physics; Physics and Astronomy; Review Paper; Strongly Correlated Systems; Superconductivity
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-017-4104-7

We have studied the high-temperature magnetic properties of a highly oriented FeSe 0.5 Te 0.5 superconducting sample produced by self-flux method. The sample was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), electrical resistivity, and magnetic measurements. The XRD pattern revealed the formation of the desired crystalline phase. In addition, two minority impurity phases, a FeSe orthorhombic phase and another Fe 3 O 4 magnetite phase, were observed. SEM micrographs showed that the sample was formed in stacked lamellas. Resistivity measurement showed that the onset superconducting temperature occurs at T c onset ∼ 14 K with a transition width Δ T = 5.5 K. Magnetic measurements at high temperature showed that the FeSe 0.5 Te 0.5 compound presents a ferromagnetic-paramagnetic (FM-PM) phase transition at ∼ 843 K. An anomaly was also observed at ∼ 122 K, which may be associated with the Verwey transition due to the presence of the magnetite phase in the sample.