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Synthesis of Bulk FeTe1−x Se x (x = 0.1−0.5) at Ambient Pressure

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Abstract

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 asshown by the field-dependent magnetization measured at room temperature.

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Acknowledgments

We would like to acknowledge the financial support from the Ministry of Education Malaysia (Fundamental Research Grant Scheme: 01-02-13-1346FR) and Universiti Putra Malaysia (Putra Grant). X. Qi would like to thank the National Science Council, Taiwan, for their financial support under the Grant No. NSC102-2221-E-006-057-MY3.

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Correspondence to S. K. Chen.

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Lim, E.H.H., Tan, K.Y., Liew, J.Y.C. et al. Synthesis of Bulk FeTe1−x Se x (x = 0.1−0.5) at Ambient Pressure. J Supercond Nov Magn 28, 2839–2845 (2015). https://doi.org/10.1007/s10948-015-3108-4

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  • DOI: https://doi.org/10.1007/s10948-015-3108-4

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