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Evidence for coupling between charge density waves and phonons in two-dimensional rare-earth tritellurides (Articolo in rivista)
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- Evidence for coupling between charge density waves and phonons in two-dimensional rare-earth tritellurides (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.78.201101 (literal)
- Alternative label
Lavagnini, M; Baldini, M; Sacchetti, A; Castro, D; Delley, B; Monnier, R; Chu, JH; Ru, N; Fisher, IR; Postorino, P; Degiorgi, L (2008)
Evidence for coupling between charge density waves and phonons in two-dimensional rare-earth tritellurides
in Physical review. B, Condensed matter and materials physics
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Lavagnini, M; Baldini, M; Sacchetti, A; Castro, D; Delley, B; Monnier, R; Chu, JH; Ru, N; Fisher, IR; Postorino, P; Degiorgi, L (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- \"[Lavagnini, M.; Sacchetti, A.; Monnier, R.; Degiorgi, L.] ETH, Festkorperphys Lab, CH-8093 Zurich, Switzerland; [Baldini, M.; Di Castro, D.; Postorino, P.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy; [Baldini, M.; Di Castro, D.; Postorino, P.] Univ Roma La Sapienza, CNR INFM Coherentia, I-00185 Rome, Italy; [Delley, B.] Paul Scherrer Inst, CH-5232 Villigen, Switzerland; [Chu, J. -H.; Ru, N.; Fisher, I. R.] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA; [Chu, J. -H.; Ru, N.; Fisher, I. R.] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA (literal)
- Titolo
- Evidence for coupling between charge density waves and phonons in two-dimensional rare-earth tritellurides (literal)
- Abstract
- We report on a Raman-scattering investigation of the charge density wave (CDW), quasi-two-dimensional rare-earth tritellurides RTe3 (R=La, Ce, Pr, Nd, Sm, Gd, and Dy) at ambient pressure, and of LaTe3 and CeTe3 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. (literal)
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