Abstract
Polycrystalline samples with nominal composition FeTe1−x S x (x = 0.00–0.30) were synthesized via solid state reaction method with intermittent grinding in argon gas flow. X-ray diffraction (XRD) patterns revealed the tetragonal structure (space group P4/nmm) of the samples with the presence of impurities Fe3O4 and FeTe2. By substitution with S, the a and c lattice parameters shrink probably due to the smaller ionic radius of S2− compared to Te2−. Scanning electron microscopy images showed that the samples developed plate-like grains with increasing S substitution. Substitution of Te with S suppresses the structural transition of the parent compound FeTe as shown by both the temperature dependence of resistance and magnetic moment measurements. All of the S-substituted samples showed a rapid drop of resistance at around 9–10 K but zero resistance down to 4 K was not observed. In addition, negative magnetic moment corresponds to diamagnetism was detected in the samples for x = 0.25 and 0.30 suggesting the coexistence of magnetic and superconducting phase in these samples. The magnetization hysteresis loops measured at room temperature showed ferromagnetic behavior for the pure and S substituted samples. However, the magnetization, rentivity and coercivity decreased with S content.
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Acknowledgements
We would like to acknowledge the financial support from Universiti Putra Malaysia through the Putra Grant (GP-I/2014/9440100). X. Qi would like to thank the Ministry of Science and Technology (formerly National Science Council), Taiwan, for their financial support under the Grant No. NSC102-2221-E-006-057-MY3.
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Lim, E.H.H., Liew, J.Y.C., Awang Kechik, M.M. et al. Preparation of polycrystalline FeTe1−x S x (x = 0.00–0.30) via solid-state reaction method at ambient pressure. Appl. Phys. A 123, 395 (2017). https://doi.org/10.1007/s00339-017-1005-3
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DOI: https://doi.org/10.1007/s00339-017-1005-3