Optical probe of charge-spin-lattice dynamics in half-doped La1.5Sr0.5NiO4

K. Yamamoto; K. Ishizaka; E. Saitoh; S. Shinomori; T. Tanabe; T. Katsufuji; Y. Tokura

Optical probe of charge-spin-lattice dynamics in half-doped La_1.5Sr_0.5NiO₄

K. Yamamoto, K. Ishizaka, E. Saitoh, S. Shinomori, T. Tanabe, T. Katsufuji, Y. Tokura

School of Advanced Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

We have investigated the charge-spin-ordering transition in La_1.5Sr_0.5NiO₄ by measurements of Raman and optical conductivity spectra. The checkerboard-type charge ordering below ∼400 K can be probed by activated phonon (A _1g and E.,) and two-magnon (B _1g) modes in the infrared and Raman spectra as well as by formation of pseudogaps in the optical conductivity spectra. Besides, another B_2g Raman mode emerges below 150 K together with reduction of the optical gap, which can be attributed to another ordering process, i.e., the stripe formation.

Original language	English
Article number	014414
Pages (from-to)	144141-144146
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	67
Issue number	1
Publication status	Published - 2003 Jan 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We have investigated the charge-spin-ordering transition in La1.5Sr0.5NiO4 by measurements of Raman and optical conductivity spectra. The checkerboard-type charge ordering below ∼400 K can be probed by activated phonon (A 1g and E.,) and two-magnon (B 1g) modes in the infrared and Raman spectra as well as by formation of pseudogaps in the optical conductivity spectra. Besides, another B2g Raman mode emerges below 150 K together with reduction of the optical gap, which can be attributed to another ordering process, i.e., the stripe formation.",

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AU - Yamamoto, K.

AU - Ishizaka, K.

AU - Saitoh, E.

AU - Shinomori, S.

AU - Tanabe, T.

AU - Katsufuji, T.

AU - Tokura, Y.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - We have investigated the charge-spin-ordering transition in La1.5Sr0.5NiO4 by measurements of Raman and optical conductivity spectra. The checkerboard-type charge ordering below ∼400 K can be probed by activated phonon (A 1g and E.,) and two-magnon (B 1g) modes in the infrared and Raman spectra as well as by formation of pseudogaps in the optical conductivity spectra. Besides, another B2g Raman mode emerges below 150 K together with reduction of the optical gap, which can be attributed to another ordering process, i.e., the stripe formation.

AB - We have investigated the charge-spin-ordering transition in La1.5Sr0.5NiO4 by measurements of Raman and optical conductivity spectra. The checkerboard-type charge ordering below ∼400 K can be probed by activated phonon (A 1g and E.,) and two-magnon (B 1g) modes in the infrared and Raman spectra as well as by formation of pseudogaps in the optical conductivity spectra. Besides, another B2g Raman mode emerges below 150 K together with reduction of the optical gap, which can be attributed to another ordering process, i.e., the stripe formation.

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