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

R. V. Yusupov (), K. Conder, T. Mertelj, D. Mihailovic, K. A. Müller and H. Keller

The European Physical Journal B: Condensed Matter and Complex Systems, 2006, vol. 54, issue 4, 465-469

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

Keywords: 74.72.Dn La-based cuprates; 72.20.Jv Charge carriers: generation; recombination; lifetime; and trapping; 74.25.Gz Optical properties; 74.25.Kc Phonons (search for similar items in EconPapers)
Date: 2006
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DOI: 10.1140/epjb/e2007-00030-x

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