Pressure dependence of the single particle excitation in the charge-density-wave CeTe${}_3$ system

Abstract

We present new data on the pressure dependence at 300 K of the optical reflectivity of CeTe${}_3$, which undergoes a charge-density-wave (CDW) phase transition well above room temperature. The collected data cover an unprecedented broad spectral range from the infrared up to the ultraviolet, which allows a robust determination of the gap as well as of the fraction of the Fermi surface affected by the formation of the CDW condensate. Upon compressing the lattice there is a progressive closing of the gap inducing a transfer of spectral weight from the gap feature into the Drude component. At frequencies above the CDW gap we also identify a power-law behavior, consistent with findings along the $R$Te${}_3$ series (i.e., chemical pressure) and suggestive of a Tomonaga-Luttinger liquid scenario at high energy scales. This newest set of data is placed in the context of our previous investigations of this class of materials and allows us to revisit important concepts for the physics of CDW state in layered-like two-dimensional systems.

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• Reconciling scaling of the optical conductivity of cuprate superconductors with Planckian resistivity and specific heat
• Suppression of charge density wave order by disorder in Pd-intercalated ErTe${}_3$
• Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions
• Temperature dependence of the excitation spectrum in the charge-density-wave ErTe${}_3$ and HoTe${}_3$ systems
• High-pressure, transport, and thermodynamic properties of CeTe3
• Optical spectroscopy study on CeTe${}_3$: evidence for multiple charge-density-wave orders
• Pressure suppression of unconventional charge-density-wave state in PrRu4P12 studied by optical conductivity
• Evolution of charge-density-wave soft phonon modes in ${\mathrm{Pd}}_x{\mathrm{ErTe}}_3$