Temperature dependence of electron spin resonance in (Formula presented) was studied in a temperature range from 2 to 350 K. It was shown that (Formula presented) was metallic above 50 K and had a metal-insulator transition at 50 K. The center frequency for the Hg(2) Raman mode in (Formula presented) at 298 K was close to those in the metallic (Formula presented) (Formula presented) and (Formula presented) while the linewidth was close to that in the metallic but nonsuperconducting (Formula presented) The Hg(2) mode showed a large blueshift and narrowing at 50 K. The center frequency and the linewidth in the low-temperature region from 50 K were almost the same as those in the insulating (Formula presented) and (Formula presented) which showed the metal-insulator transition at 50 K in (Formula presented) The origin of this metal-insulator transition was discussed in terms of the electron-phonon interaction (Jahn-Teller effect) and the electron-electron interaction (Mott-Hubbard picture).
|Number of pages||8|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1999|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics