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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


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.

Original languageEnglish
Article number014414
Pages (from-to)144141-144146
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2003 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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