R. Terbruggen, Notificatie Etc

Groot, Hofstede de

doi:10.1007/978-94-015-3219-8_67

Cited by 2 publications

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“…However, due to the fact that Fe and Si have practically the same electronegativity and electron affinity, strong ionicity is not expected from a chemical point of view, nor has it been inferred from ab initio calculations of the electron density distribution. 6,14 This situation is reminiscent of the IV-VI narrow-gap semiconductors PbS, PbSe, PbTe and SnTe where Z values between 5 and 8 were found. For the latter systems this has been attributed to a resonance (or mesomeric) bonding effect.…”

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Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

et al. 1997

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From an investigation of the optical conductivity of FeSi single crystals using FTIR spectroscopy in the frequency range from 30 to 20 000 cm −1 we conclude that the transverse effective charge of the Fe and Si ions is approximately 4e.Of the five optical phonons which are allowed by symmetry we observe only four, three of which have a Fano line shape presumably resulting from an interaction of these modes with the electronic continuum. We show that the large oscillator strength of the phonons results from a relatively weak coupling (λ ≈ 0.1) of the lattice degrees of freedom to an electronic resonance above the semiconductor gap, which is also responsible for the large electronic polarizability (ǫ ∞ ≈ 200) of the medium.

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Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

et al. 1997

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“…Regarding the spintronics, half-metallic materials have many advantages because one spin channel is conductive, but the other spin channel is insulating. 1,2 This will result in a giant magnetoresistance, which is an essential quality for spintronics. Various types of materials show a half-metallic state, but most of them are based on the conventional 3d transition metal elements.…”

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Spin-Dependent Transport and Optical Properties of Transparent Half-Metallic g-C₄N₃ Films

Hashmi

Farooq

et al. 2015

J. Phys. Chem. C

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Half-metallic materials play an essential role in the spin-dependent transport study, and so far it is believed that the 3d transitional metal elements are necessary to obtain a ferromagnetic state. Herein, we demonstrate that the metal free two-dimensional graphitic carbon nitride (g-C4N3) film show half metallic state and this is independent of the film thickness and stacking order. We find that the half-metallicity results in a very large magnetoresistance even at finite bias. Moreover, we have also investigated various optical properties. The g-C4N3 thin films have a very high refractive index for parallel polarization and extremely weak reflectivity for perpendicular polarization. Additionally, the g-C4N3 thin films are optically transparent because of very weak absorption coefficients. Overall, our findings suggest that the transparent half-metallic g-C4N3 thin films can be used for both spintronics and optical applications because of potential multifunctionality.

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R. Terbruggen, Notificatie Etc

Cited by 2 publications

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Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

Spin-Dependent Transport and Optical Properties of Transparent Half-Metallic g-C₄N₃ Films

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R. Terbruggen, Notificatie Etc

Cited by 2 publications

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Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

Infrared spectroscopic study of phonons coupled to charge excitations in FeSi

Spin-Dependent Transport and Optical Properties of Transparent Half-Metallic g-C4N3 Films

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Spin-Dependent Transport and Optical Properties of Transparent Half-Metallic g-C₄N₃ Films