Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites

Details Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites Evidence for the immobile bipolaron formation in the paramagnetic state of the magnetoresistive manganites

2000-06-30

arxiv.org/abs/cond-mat/0006489v2

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 5 figures, monor corrections

Scientific paper

10.1103/PhysRevB.62.R11949

Recent research suggests that the charge carriers in the paramagnetic state of the magnetoresistive manganites are small polarons. Here we report studies of the oxygen-isotope effects on the intrinsic resistivity and thermoelectric power in several ferromagnetic manganites. The precise measurements of these isotope effects allow us to make a quantitative data analysis. Our results do not support a simple small-polaron model, but rather provide compelling evidence for the presence of small immobile bipolarons, i.e., pairs of small polarons. Since the bipolarons in the manganites are immobile, the present result alone appears not to give a positive support to the bipolaronic superconductivity theory for the copper-based perovskites.

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