2003/04/11 by Clark Sheldon Snow, C. S. Snow, J. F. Karpus +4 · 2 citations
Engineering · Materials Science · Physics and Astronomy · #2D Materials and Applications #Organic and Molecular Conductors Research #Perovskite Materials and Applications #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.91.136402
5 pages, 4 figures
arxiv created 2003/04/11 · openalex publication_date 2003/09/24 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/04
We report a Raman scattering study of low-temperature, pressure-induced melting of the charge-density-wave (CDW) phase of 1T\mathrm\text\ensuremath-TiSe2. Our measurements reveal that the collapse of the CDW state occurs in three stages: (i) For P<5 kbar, the pressure dependence of the CDW amplitude mode energies and intensities are indicative of a ``crystalline'' CDW regime; (ii) for 5<P<25 kbar, there is a decrease in the CDW amplitude mode energies and intensities with increasing pressure that suggests a regime in which the CDW softens, and exhibits enhanced fluctuations; and (iii) for P>25 kbar, the absence of amplitude modes reveals a metallic regime in which the CDW has melted.