Abstract.
The infrared photo-induced spectra of the isotope-substituted stoichiometric La2CuO4 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 16O to 18O is found for the high-energy surface carrier associated band (~4000 cm-1) and has a value of αO = 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.
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Yusupov, R., Conder, K., Mertelj, T. et al. The oxygen isotope effect on the infrared photo-induced absorption spectra of La2CuO4 . Eur. Phys. J. B 54, 465–469 (2006). https://doi.org/10.1140/epjb/e2007-00030-x
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DOI: https://doi.org/10.1140/epjb/e2007-00030-x