Optical and electrical properties of β-FeSi2 single crystals

Wang, J.F.; Saitou, S.; Ji, Shiyang; Katahira, Yoshiaki; Isshiki, Minoru

doi:10.1016/j.jcrysgro.2007.02.017

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…In this situation, iodine acts as a catalyst as well as a transporting agent [29][30][31] that may have carried a certain amount of FeTe 2 to form the unknown material on the wall of the quartz tube.…”

Section: Resultsmentioning

confidence: 99%

Effects of Iodine Annealing on Fe₁₊_yTe_0.6Se_0.4

et al. 2016

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Effects of iodine annealing to induce bulk superconductivity in Fe 1+y Te 0.6 Se 0.4 have been systematically studied by changing the molar ratio of iodine to the sample and annealing temperature. The optimal condition to induce bulk superconductivity with T c ~14.5 K and self-field J c (2 K) ~ 5×10 5 A/cm 2 is found to be a molar ratio of iodine of 5-7 % at the annealing temperature of 400 °C. Furthermore, the fact that no compounds containing iodine are detected in the crystal and a significant amount of FeTe 2 is produced after the iodine annealing strongly indicate that the excess iron is consumed to form FeTe 2 and iodine works as a catalyst in this process.

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Section: Resultsmentioning

confidence: 99%

Effects of Iodine Annealing on Fe₁₊_yTe_0.6Se_0.4

et al. 2016

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“…2 Observations of luminescence at 1.5 m have been reported from ␤ − FeSi 2 grown by various techniques. [3][4][5][6][7] However, luminescence is not guaranteed, and its origin is still uncertain. In fact, the nature of the energy gap ͑direct or indirect͒ is also not well determined.…”

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confidence: 99%

Evidence for an indirect gap in β−FeSi2 epilayers by photoreflectance spectroscopy

Birdwell

Littler

Glosser

et al. 2008

Applied Physics Letters

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Photoreflectance spectra obtained from epitaxial films of semiconducting ␤ − FeSi 2 exhibit complex line shapes resulting from a variety of optical transitions. While we have previously established a direct gap at 0.934Ϯ 0.002 eV at 75 K, we find an additional weak structure at a lower energy. We attribute the origin of this spectral feature to indirect transitions assisted by the emission of a phonon. From our analysis, we determine an indirect gap energy of 0.823Ϯ 0.002 eV at 75 K.

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