Journal
PHYSICAL REVIEW B
Volume 81, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.081101
Keywords
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Funding
- Swiss National Foundation for the Scientific Research
- NCCR MaNEP
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Deutsche Forschungsgemeinschaft [Ha2071/3-4, Ha2071/5-1]
- Bavarian-Californian Technology Center
- [FOR538]
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The two-dimensional rare-earth tritellurides undergo a unidirectional charge-density-wave (CDW) transition at high temperature and, for the heaviest members of the series, a bidirectional one at low temperature. Raman scattering experiments as a function of temperature on DyTe(3) and on LaTe(3) at 6 GPa provide a clear-cut evidence for the emergence of the respective collective CDW amplitude excitations. In the unidirectional CDW phase, we discover that the amplitude mode develops as a succession of two mean-field BCS-like transitions with different critical temperatures, which we associate with the presence of two adjacent Te planes in the structure.
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