Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode

Details Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode

2009-09-07

arxiv.org/abs/0909.1289v1

Phys. Rev. B81, 081101(R) (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

The two-dimensional rare-earth tri-tellurides undergo a unidirectional charge-density-wave (CDW) transition at high temperature and, for the heaviest members of the series, a bidirectional one at low temperature. Raman scattering experiments as a function of temperature on DyTe$_3$ and on LaTe$_3$ at 6 GPa provide a clear-cut evidence for the emergence of the respective collective CDW amplitude excitations. In the unidirectional CDW phase, we surprisingly discover that the amplitude mode develops as a succession of two mean-field, BCS-like transitions in different temperature ranges.

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