Action spectra of the two-stage photoinduced insulator-metal transition in Pr1-xCaxMnO3

M. Fiebig, K. Miyano, T. Satoh, Y. Tomioka, Y. Tokura

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Abstract

The action spectra for the photoinduced insulator-metal transition in Pr1-xCaxMnO3 were investigated in the 0.45-3.05eV range. The photon-density threshold for the transition exhibits a gaplike behavior a∼0.4eV with anisotropic features, and it is insensitive to the degree of carrier doping x. A two-stage mechanism is proposed for the transition. In the first stage, photoexcited charge carriers melt down the charge-ordered state by screening effects, which is followed by a local formation of metastable metallic domains. In the second stage, the barrier between the metallic domains is overcome by an applied electric field resulting in a continuous conducting path that remains stable as long as the current is maintained.

Original languageEnglish
Pages (from-to)7944-7949
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume60
Issue number11
DOIs
Publication statusPublished - Jan 1 1999

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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