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Quantum Melting Of The Charge-Density-Wave State In 1t-Tise2, C. S. Snow, J. F. Karpus, S. L. Cooper, T. E. Kidd, T.-C. Chiang

Faculty Publications

We report a Raman scattering study of low-temperature, pressure-induced melting of the charge-density- wave (CDW) phase of 1T-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.