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CDW phase mode investigation in the FIR in K0.3MaO3 and band structure calculation

  • G. Travaglini
  • P. Wachter
II. Static Propertis of CDW Systems
Part of the Lecture Notes in Physics book series (LNP, volume 217)

Abstract

Optical reflectivity has been measured in the far infrared (FIR) region on the blue bronze K0.3MoO3 system using polarized light. At room temperature the reflectance spectrum polarized (P) parallel to the b-axis is metal-like while the perpendicular spectrum is semiconductor-like. For T<Tc = 180 K the P∥b spectrum becomes also semiconductor-like with a very strong polarization dependent phonon spectrum. At hω < 8 meV a giant structure dominates the whole P∥b spectrum. The structure, reaching reflectivity values of 97% and having a width of 7 meV, is assigned to the phase oscillations of the pinned CDW. Optical constants are calculated by means of the Kramers Kronig relation. An LCAO calculation has been performed for one chain of K0.3MoO3: the results E(k), EF, kF, D(EF) m*e are compared with the experimental data.

Keywords

Optical Conductivity Band Structure Calculation Phonon Line Transversal Frequency Energy Dispersion Relation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. [1]
    J. Graham and A.D. Wadsley, Acta Cryst. 20, 93 (1966).Google Scholar
  2. [2]
    G. Travaglini and P. Wachter, J. Phys. Soc. Jap. Suppl. A, 49, 869 (1980).Google Scholar
  3. [2a]
    G. Travaglini, P. Wachter, J. Marcus and C. Schlenker, Solid State Commun. 37, 599 (1981).Google Scholar
  4. [3]
    N.C. Stephenson, A.D. Wadsley, Acta Cryst. 18, 241 (1965).Google Scholar
  5. [4]
    L.F. Mattheis, Phys. Rev. B6, 4718 (1972).Google Scholar
  6. [5]
    R. Brusetti, B.K. Chakraverty, J. Devenyi, J. Dumas, J. Marcus and C. Schlenker in Proc. of the Annual Conference of Condensed Matter Div. Europhysical Society, Antwerp 1980.Google Scholar
  7. [6]
    G. Grüner, A. Zawadowski and P.M. Chaikin: Phys. Rev. Lett. 46, 511 (1981).Google Scholar
  8. [7]
    J. Dumas, C. Schlenker, J. Marcus and R. Buder: Phys. Rev. Lett., 50, 757 (1983).Google Scholar
  9. [8]
    G. Travaglini and P. Wachter, Phys. Rev. B30, (1984).Google Scholar
  10. [9]
    G. Travaglini, I. Mörke and P. Wachter, Solid State Commun. 43, 289 (1983).Google Scholar
  11. [10]
    E.F. Steigmeier, R. London, G. Harbeke and H. Andersen, Solid State Commun. 17, 1447 (1975).Google Scholar
  12. [11]
    P. Brüesch, S. Strässler and H.R. Zeller, Phys. Rev. 812, 219 (1975).Google Scholar

Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • G. Travaglini
    • 1
  • P. Wachter
    • 1
  1. 1.Laboratorium für FestkörperphysikZurichSwitzerland

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