Optical investigations of the clathrate α-Eu8Ga16Ge30

Sichelschmidt, J.; Voevodin, V.; Pacheco, V.; Grin, Y.; Steglich, F.; Nishi, T.; Kimura, S.

doi:10.1140/epjb/e2005-00265-5

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Optical investigations of the clathrate α-Eu₈Ga₁₆Ge₃₀

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Sichelschmidt, J.
Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Voevodin, V.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Pacheco, V.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin, Y.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich, F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Sichelschmidt, J., Voevodin, V., Pacheco, V., Grin, Y., Steglich, F., Nishi, T., et al. (2005). Optical investigations of the clathrate α-Eu₈Ga₁₆Ge₃₀. The European Physical Journal B, Condensend Matter Physics, 46(3), 363-366. doi:10.1140/epjb/e2005-00265-5.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-2CAF-9

Abstract

We performed measurements of the optical reflectivity in the energy range 0.007–30 eV on the clathrate-VIII type compound α-Eu8Ga16- xGe30 x in order to investigate its electronic band structure. The very low charge carrier concentration as well as ferromagnetic ordering of the divalent Eu ions below 10.5 K characterize the spectra at photon energies below ≃0.4 eV in accordance with the results of band structure calculations. Disorder induced bound states have been identified to affect the optical conductivity at energies between 10 and 100 meV.