The oxygen isotope effect on the infrared photo-induced absorption spectra of La2CuO4

被引：0
|
作者：
R. V. Yusupov
K. Conder
T. Mertelj
D. Mihailovic
K. A. Müller
H. Keller
机构：
[1] Jozef Stefan Institute,
[2] Laboratory for Neutron Scattering,undefined
[3] University of Ljubljana,undefined
[4] Physik-Institut der Universität Zürich,undefined
来源：
The European Physical Journal B - Condensed Matter and Complex Systems | 2006年 / 54卷
关键词：
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;
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摘要：
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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页码：465 / 469
页数：4
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