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.
| 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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Yamamoto, K., Ishizaka, K., Saitoh, E., Shinomori, S., Tanabe, T., Katsufuji, T., & Tokura, Y. (2003). Optical probe of charge-spin-lattice dynamics in half-doped La1.5Sr0.5NiO4. Physical Review B - Condensed Matter and Materials Physics, 67(1), 144141-144146. [014414].