Dynamic conductivity of semiconducting manganites approaching the metal-insulator transition

Details Dynamic conductivity of semiconducting manganites approaching the metal-insulator transition Dynamic conductivity of semiconducting manganites approaching the metal-insulator transition

2005-10-10

arxiv.org/abs/cond-mat/0510228v1

Ann. Phys. (Leipzig) 15, 498 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 7 figures

Scientific paper

10.1002/andp.200510200

We report the frequency-dependent conductivity of the manganite system La1-xSrxMnO3 (x <= 0.2) when approaching the metal-insulator transition from the insulating side. Results from low-frequency dielectric measurements are combined with spectra in the infrared region. For low doping levels the behavior is dominated by hopping transport of localized charge carriers at low frequencies and by phononic and electronic excitations in the infrared region. For the higher Sr contents the approach of the metallic state is accompanied by the successive suppression of the hopping contribution at low frequencies and by the development of polaronic excitations in the infrared region, which finally become superimposed by a strong Drude contribution in the fully metallic state.

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