Optical study on the doping and temperature dependence of the anisotropic electronic structure in bilayered manganites: La2-2xSr1+2xMn2O7 (0.3≤x≤0.5)

T. Ishikawa, K. Tobe, T. Kimura, T. Katsufuji, Y. Tokura

研究成果査読

36 被引用数 (Scopus)

抄録

The electronic structure of bilayered manganite (La2-2xSr1+2xMn2O7) has been investigated by optical measurements. In the paramagnetic phase, the in-plane and out-of-plane optical spectra show a doping dependence reflecting the change in the orbital character of conduction electrons. A drastic electronic structural change has been observed with the evolution of in-plane magnetic ordering irrespective of the ferromagnetic (e.g., x=0.4) or antiferromagnetic (x=0.3) interbilayer magnetic coupling. The optical conductivity spectra of the ferromagnetic state show a strongly incoherent feature, such as a minimal Drude component followed by a dominant broad peak centered around 0.4 eV. Anomalies in the phonon spectra are found in the antiferromagnetic state of the x=0.45 and 0.5 compounds, indicating a different structural change accompanied by the A-type antiferromagnetic (and perhaps x2-y2-type orbital) ordering. The relevant charge ordering and lattice distortion may be responsible for the nonmetallic nature of the A-type antiferromagnetic phase.

本文言語English
ページ(範囲)12354-12362
ページ数9
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
62
18
DOI
出版ステータスPublished - 2000 11 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

フィンガープリント

「Optical study on the doping and temperature dependence of the anisotropic electronic structure in bilayered manganites: La<sub>2-2x</sub>Sr<sub>1+2x</sub>Mn<sub>2</sub>O<sub>7</sub> (0.3≤x≤0.5)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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