Evidence for coupling between collective state and phonons in two-dimensional charge-density-wave systems
Description:
We report on a Raman scattering investigation of the charge-density-wave (CDW), quasi two-dimensional rare-earth tri-tellurides RTe{sub 3} (R = La, Ce, Pr, Nd, Sm, Gd and Dy) at ambient pressure, and of LaTe{sub 3} and CeTe{sub 3} under externally applied pressure. The observed phonon peaks can be ascribed to the Raman active modes for both the undistorted as well as the distorted lattice in the CDW state by means of a first principles calculation. The latter also predicts the Kohn anomaly in t…
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Date:
February 15, 2010
Creator:
Lavagnini, M.; Baldini, M.; Sacchetti, A.; Castro, D. Di; Delley, B.; Monnier, R. et al.
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