Theory of optical conductivity in doped manganites

Details Theory of optical conductivity in doped manganites Theory of optical conductivity in doped manganites

1999-01-29

arxiv.org/abs/cond-mat/9901340v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, REVTeX 3.0, four eps-figures included in the text. Minor typos corrected in text and figure 2 caption, references upd

Scientific paper

The frequency and temperature dependence of the optical conductivity of ferromagnetic manganites is explained within the framework of the bipolaron theory. As these materials are cooled below the Curie temperature, the colossal magnetoressitance (CMR) is accompanied by a massive transfer of the spectral weight of the optical conductivity to lower frequencies. As with the CMR itself, this change in the optical conductivity is explained by the dissociation of bipolarons into small polarons by exchange interaction with the localized Mn spins during the transition to the low temperature ferromagnetic phase.

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