Incoherent charge dynamics in perovskite manganese oxides

Hiroki Nakano, Yukitoshi Motome, Masatoshi Imada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A minimal model is proposed for the perovskite manganese oxides showing strongly incoherent charge dynamics with a suppressed Drude weight in the ferromagnetic and metallic phase near the insulator. We investigate a generalized double-exchange model which includes three elements; the orbital degeneracy of eg conduction bands, the Coulomb interaction and fluctuating Jahn-Teller distortions. We demonstrate that Lanczös diagonalization calculations combined with Monte Carlo sampling of the largely fluctuating lattice distortions result in the optical conductivity which quantitatively accounts for the experimental indications. It is found that all three elements are indispensable for understanding the charge dynamics in these compounds.

Original languageEnglish
Pages (from-to)1282-1285
Number of pages4
JournalJournal of the Physical Society of Japan
Volume69
Issue number5
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

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manganese oxides
conduction bands
indication
sampling
insulators
orbitals
conductivity
interactions

Keywords

  • Coulomb interaction
  • Double-exchange model
  • Drude weight
  • Exact diagonalization
  • Ferromagnetic metal
  • Incoherent charge dynamics
  • Jahn-Teller distortion
  • Metal-insulator transition
  • Optical conductivity
  • Orbital degeneracy
  • Perovskite manganites

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Incoherent charge dynamics in perovskite manganese oxides. / Nakano, Hiroki; Motome, Yukitoshi; Imada, Masatoshi.

In: Journal of the Physical Society of Japan, Vol. 69, No. 5, 01.01.2000, p. 1282-1285.

Research output: Contribution to journalArticle

Nakano, Hiroki ; Motome, Yukitoshi ; Imada, Masatoshi. / Incoherent charge dynamics in perovskite manganese oxides. In: Journal of the Physical Society of Japan. 2000 ; Vol. 69, No. 5. pp. 1282-1285.
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