Phys. Rev. B 62, 12354–12362 (2000)

Optical study on the doping and temperature dependence of the anisotropic electronic structure in bilayered manganites: La_2-2xSr_1+2xMn₂O₇ (0.3<~x<~0.5)

Abstract

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T. Ishikawa^* and K. Tobe
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

T. Kimura^†
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan

T. Katsufuji^‡
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan

Y. Tokura
Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan
Joint Research Center for Atom Technology (JRCAT), Tsukuba 305-0046, Japan

Received 12 April 2000; published in the issue dated 1 November 2000

The electronic structure of bilayered manganite (La_2-2xSr_1+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.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.62.12354

DOI:

10.1103/PhysRevB.62.12354

PACS:

71.30.+h, 75.30.Vn, 78.30.-j

^*Present address: Department of Condensed Matter Physics, Tokyo Institute of Technology, Oh-okayama, Tokyo 152-8551, Japan.

^†Present address: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

^‡Present address: Graduate School of Frontier Sciences, University of Tokyo, Tokyo 113-8656, Japan.

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Phys. Rev. B 62, 12354–12362 (2000)

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

Optical study on the doping and temperature dependence of the anisotropic electronic structure in bilayered manganites: La_2-2xSr_1+2xMn₂O₇ (0.3<~x<~0.5)