Journal article
Electron-Phonon Coupling and the Soft Phonon Mode in TiSe2
Physical review letters, v 107(26), pp 266401-266401
20 Dec 2011
PMID: 22243169
Abstract
We report high-resolution inelastic x-ray measurements of the soft phonon mode in the charge-density-wave compound TiSe2. We observe a complete softening of a transverse optic phonon at the L point, i.e., q = (0.5, 0, 0.5), at T approximate to T-CDW. Detailed ab initio calculations for the electronic and lattice dynamical properties of TiSe2 are in quantitative agreement with experimental frequencies for the soft phonon mode. The observed broad range of renormalized phonon frequencies, (0.3, 0, 0.5) <= q <= (0.5, 0, 0.5), is directly related to a broad peak in the electronic susceptibility stabilizing the charge-density-wave ordered state. Our analysis demonstrates that a conventional electron-phonon coupling mechanism can explain a structural instability and the charge-density-wave order in TiSe2 although other mechanisms might further boost the transition temperature.
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Details
- Title
- Electron-Phonon Coupling and the Soft Phonon Mode in TiSe2
- Creators
- F. Weber - Karlsruhe Institute of TechnologyS. Rosenkranz - Argonne National LaboratoryJ-P Castellan - Argonne National LaboratoryR. Osborn - Argonne National LaboratoryG. Karapetrov - Argonne National LaboratoryR. Hott - Karlsruhe Institute of TechnologyR. Heid - Karlsruhe Institute of TechnologyK-P Bohnen - Karlsruhe Institute of TechnologyA. Alatas - Argonne National Laboratory
- Publication Details
- Physical review letters, v 107(26), pp 266401-266401
- Publisher
- Amer Physical Soc
- Number of pages
- 5
- Grant note
- DE-AC02-06CH11357 / U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000298607400007
- Scopus ID
- 2-s2.0-84455202158
- Other Identifier
- 991019174142204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Multidisciplinary