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Optical properties of the charge-density-wave polychalcogenide compounds R 2Te 5 (R=Nd, Sm and Gd)

Pfuner, F. ; Degiorgi, L. ; Shin, K. Y. ; Fisher, I. R.

In: The European Physical Journal B, 2008, vol. 63, no. 1, p. 11-16

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    Titre
    • Optical properties of the charge-density-wave polychalcogenide compounds R 2Te 5 (R=Nd, Sm and Gd)
    Auteur
    • Pfuner, F.. Laboratorium für Festkörperphysik, ETH - Zürich, 8093, Zürich, Switzerland
    • Degiorgi, L.. Laboratorium für Festkörperphysik, ETH - Zürich, 8093, Zürich, Switzerland
    • Shin, K. Y.. Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, 94305-4045, Stanford, California, USA
    • Fisher, I. R.. Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, 94305-4045, Stanford, California, USA
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:317229
    Summary
    Abstract.: We investigate the rare-earth polychalcogenide R2Te5 (R=Nd, Sm and Gd) charge-density-wave (CDW) compounds by optical reflectivity measurements. We obtain the optical conductivity through Kramers-Kronig transformation of the reflectivity spectra. From the real part of the optical conductivity we then extract the excitation energy of the CDW gap and estimate the fraction of the Fermi surface which is gapped by the formation of the CDW condensate. In analogy to previous findings on the related RTen (n=2 and 3) families, we establish the progressive closing of the CDW gap and the moderate enhancement of the metallic component upon chemically compressing the lattice