Pressure dependence of the optical properties of the charge-density-wave compound LaTe${}_2$

Abstract

We report the pressure dependence of the optical response of LaTe${}_2$, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 7 GPa. We extract the energy scale due to the single particle excitation across the CDW gap and the Drude weight. We establish that the gap decreases upon compressing the lattice, while the Drude weight increases. This signals a reduction in the quality of nesting upon applying pressure, therefore inducing a lesser impact of the CDW condensate on the electronic properties of LaTe${}_2$. The consequent suppression of the CDW gap leads to a release of additional charge carriers, manifested by the shift of weight from the gap feature into the metallic component of the optical response. On the contrary, the power-law behavior, seen in the optical conductivity at energies above the gap excitation and indicating a weakly interacting limit within the Tomonaga-Luttinger liquid scenario, seems to be only moderately dependent on pressure.

References in corpus (5)

• Pressure-induced deconfinement of the charge transport in the quasi-one-dimensional Mott insulator (TMTTF)_2AsF_6
• Pressure dependence of the charge-density-wave gap in rare-earth tri-tellurides
• Chemical pressure and hidden one-dimensional behavior in rare earth tri-telluride charge density wave compounds
• Revealing Charge Density Wave Formation in the LaTe_2 System by Angle Resolved Photoemission Spectroscopy
• Optical properties of the Ce and La di-telluride charge density wave compounds

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• A simple method for the Kramers-Kronig analysis of reflectance spectra measured with diamond anvil cell
• Optical properties of the charge-density-wave polychalcogenide compounds $R_2$Te${}_5$ ($R$=Nd, Sm and Gd)
• Interplay of Charge Density Wave States and Strain at the Surface of CeTe${}_2$
• Electrodynamics of BaFe2As2 from infrared measurements under pressure
• Pressure suppression of unconventional charge-density-wave state in PrRu4P12 studied by optical conductivity