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The oxygen isotope effect on the infrared photo-induced absorption spectra of La 2 CuO 4

Author

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  • R. V. Yusupov
  • K. Conder
  • T. Mertelj
  • D. Mihailovic
  • K. A. Müller
  • H. Keller

Abstract

The infrared photo-induced spectra of the isotope-substituted stoichiometric La 2 CuO 4 samples were studied at T=20 K. Measured spectra were analyzed within the small polaron hopping theory. A small, but detectable shift of the effective phonon frequency on the substitution 16 O to 18 O is found for the high-energy surface carrier associated band (~4000 cm -1 ) and has a value of α O =0.3 ±0.2. The low-energy band (~1500 cm -1 ) originating from the bulk carriers doesn't show any difference within experimental error which is fully in agreement with theory predictions. The isotope shifts of the optically active oxygen-related phonon modes are described well by the harmonic approximation. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2006

Suggested Citation

  • R. V. Yusupov & K. Conder & T. Mertelj & D. Mihailovic & K. A. Müller & H. Keller, 2006. "The oxygen isotope effect on the infrared photo-induced absorption spectra of La 2 CuO 4," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 54(4), pages 465-469, December.
    • Handle: RePEc:spr:eurphb:v:54:y:2006:i:4:p:465-469
    DOI: 10.1140/epjb/e2007-00030-x
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