| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|---|---|---|
| Page(s) | C6-740 - C6-742 | |
| DOI | https://doi.org/10.1051/jphyscol:19816217 | |
J. Phys. Colloques 42 (1981) C6-740-C6-742
DOI: 10.1051/jphyscol:19816217
INVESTIGATION OF THE CHARGE DENSITY WAVES IN IT-VSe2 BY RAMAN SCATTERING
S. Sugai1, 2, K. Murase1, S. Uchida3 et S. Tanaka31 Department of physics, Osaka University, Toyonaka, 560 Japan
2 Div. Engineering, Brown University, Providence, RI 02912
3 Department of Applied Physics, University of Tokyo, Tokyo, 113 Japan
Abstract
The lattice dynamics in 1T-VSe2 was investigated by Raman scattering in the normal phase (> 112 K ) , the incommensurate charge density wave (ICDW) phase (80 - 112 K) and the commensurate charge density wave (CCDW) phase of 4ao x 4ao (< 80 K). Recently the stacking of the layers was observed to be incommensurate even in the lowest temperature phase. In the normal phase two modes were observed. In the CDW phase new peaks appear in the A1g - symmetry 50, 62 and 174 cm-1 due to the formation of the super-lattice. The 50 cm-1 mode showed softening toward the CDW to normal phase transition temperature. The observed CDW peaks are broad reflecting the incommensurability along the direction perpendicular to the layer. A central peak was observed in the CDW phase.