期刊
PHYSICAL REVIEW B
卷 78, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.201101
关键词
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资金
- Swiss National Foundation for Scientific Research
- NCCR MaNEP pool
- Department of Energy
- Office of Basic Energy Sciences [DE-AC02-76SF00515]
We report on a Raman-scattering investigation of the charge density wave (CDW), quasi-two-dimensional rare-earth tritellurides RTe(3) (R=La, Ce, Pr, Nd, Sm, Gd, and Dy) at ambient pressure, and of LaTe(3) and CeTe(3) under externally applied pressure. The observed phonon peaks can be ascribed to the Raman-active modes for both the undistorted and the distorted lattices in the CDW state by means of a first-principles calculation. The latter also predicts the Kohn anomaly in the phonon dispersion, driving the CDW transition. The integrated intensity of the two most prominent modes scales as a characteristic power of the CDW-gap amplitude upon compressing the lattice, which provides clear evidence for the tight coupling between the CDW condensate and the vibrational modes.
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