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Synthesis of bulk FeTe1−xSex (x = 0.1−0.5) at ambient pressure


Lim, Edmund Hua Hang and Tan, K. Y. and Liew, Josephine Ying Chyi and Awang Kechik, Mohd Mustafa and Shaari, Abdul Halim and Chen, Soo Kien and Tan, Kar Ban and Qi, Xiaoding (2015) Synthesis of bulk FeTe1−xSex (x = 0.1−0.5) at ambient pressure. Journal of Superconductivity and Novel Magnetism, 28 (9). pp. 2839-2845. ISSN 1557-1939; ESSN: 1557-1947


In this study, polycrystalline samples with nominal composition FeTe1−xSe x (x=0.1−0.5) were synthesized by solid-state reaction method at ambient pressure. In order to minimize oxidation, argon gas flow was maintained throughout the heat treatment. The phase formation of FeTe1−xSe x samples was checked by X-ray diffraction (XRD). The polycrystalline FeTe1−xSe x samples were indexed to a tetragonal structure with space group of P4/nmm. The lattice parameters a- and c-axes shrink significantly with the substitution of Se. As shown by the scanning electron microscope (SEM) images, the samples developed a plate-like grain structure gradually with the increase of Se concentration. Measurements of temperature dependence of magnetic moment showed that the onset of superconducting transition temperature, T c, increased with Se concentration. The T c is about 10.6 and 13.5 K for x= 0.1 and 0.5, respectively. All the samples exhibit ferromagnetic behavior as shown by the field-dependent magnetization measured at room temperature.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1007/s10948-015-3108-4
Publisher: Springer
Keywords: Fe-based superconductor; Magnetic properties; Se substitution; Superconductivity
Depositing User: Nabilah Mustapa
Date Deposited: 12 Apr 2016 04:46
Last Modified: 23 May 2018 01:22
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1007/s10948-015-3108-4
URI: http://psasir.upm.edu.my/id/eprint/42217
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