Optical probe of anisotropic and incoherent charge dynamics in a layered ferromagnet: La1.2Sr1.8Mn2O7

T. Ishikawa, T. Kimura, Takuro Katsufuji, Y. Tokura

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Abstract

Highly anisotropic optical conductivity spectra and their temperature variation have been investigated for a layered ferromagnetic (Tc=121 K) crystal of La2-2xSr1-2xMn2O7 (x=0.4). The in-plane spectra show conspicuous spectral-weight transfer over an energy region of 0-3 eV with evolution of spin polarization below Tc and in the ferromagnetic, highly conducting ground state form a prominent peak structure around 0.4 eV with minimal Drude weight. By contrast, the c-axis spectra show little change with temperature and remain insulatorlike. The results indicate highly incoherent dynamics of the fully quasi-two dimensional spin-polarized carriers.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume57
Issue number14
Publication statusPublished - 1998 Apr 1
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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