Photoinduced IR absorption in (La(1-x)Sr(x)Mn)(1-δ)O3: changes of the anti-Jahn-Teller polaron binding energy with doping
Abstract
Photoinduced IR absorption was measured in (La(1-x)Sr(x)Mn)(1-δ)O3. A midinfrared peak centered at ~ 5000 cm-1 was observed in the x=0 antiferromagnetic sample. The peak diminishes and softens as hole doping is increased. The origin of the photoinduced absorption peak is atributted to the photon assisted hopping of anti-Jahn-Teller polarons formed by photoexcited charge carriers, whose binding energy decreases with increasing hole doping. The shape of the peak indicates that the polarons are small.
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