Coherent-incoherent crossover of charge dynamics in the ferromagnetic ground state of manganites: R0.6Sr0.4MnO3(R = La - Sm)

E. Saitoh, Y. Okimoto, Y. Tomioka, T. Katsufuji, Y. Tokura

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Abstract

Low-energy optical spectra and their temperature dependence have been investigated for single crystals of perovskite-type manganese oxides, R1-xSrxMnO3, at a fixed doping level (x=0.4) but with varying perovskite R species or one-electron bandwidth (W). Variation of the optical conductivity spectra with a change of R, such as a diminishment of the Drude peak and the emergence of a nearly ω-independent component, indicates a coherent-incoherent crossover of charge dynamics in the ferromagnetic metallic phase. This cannot be accounted for in terms of simple change in carrier mass or scattering rate, but indicates the importance of competitive instabilities triggered by decreasing W against the double-exchange interaction near the charge/orbital-ordering instability.

Original languageEnglish
Pages (from-to)10362-10366
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number14
DOIs
Publication statusPublished - 1999 Jan 1

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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