The Annealing Effects in the Iron-Based Superconductor FeTe0.8Se0.2 Prepared by the Self-Flux Method

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. Xray 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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Preparation of polycrystalline FeTe1−x S x (x = 0.00–0.30) via solid-state reaction method at ambient pressure

Lim

Liew

Kechik

et al. 2017

Appl. Phys. A

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Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments

et al. 2018

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

Lim

Tan

Liew

et al. 2015

J Supercond Nov Magn

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In this study, polycrystalline samples with nominal composition FeTe 1−x Se 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 FeTe 1−x Se x samples was checked by X-ray diffraction (XRD). The polycrystalline FeTe 1−x Se 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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The Annealing Effects in the Iron-Based Superconductor FeTe0.8Se0.2 Prepared by the Self-Flux Method

Cited by 12 publications

References 20 publications

Preparation of polycrystalline FeTe1−x S x (x = 0.00–0.30) via solid-state reaction method at ambient pressure

Preparation of polycrystalline FeTe1−x S x (x = 0.00–0.30) via solid-state reaction method at ambient pressure

Improvements of high-field pinning properties of polycrystalline Fe(Se,Te) material by heat treatments

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

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