Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides

Details Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides

2006-09-07

arxiv.org/abs/cond-mat/0609175v1

Phys. Rev. Lett. 98, 026401 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

We investigate the pressure dependence of the optical properties of CeTe$_3$, which exhibits an incommensurate charge-density-wave (CDW) state already at 300 K. Our data are collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 9 GPa. The energy for the single particle excitation across the CDW gap decreases upon increasing the applied pressure, similarly to the chemical pressure by rare-earth substitution. The broadening of the bands upon lattice compression removes the perfect nesting condition of the Fermi surface and therefore diminishes the impact of the CDW transition on the electronic properties of $R$Te$_3$.

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