Evidence for coupling between collective state and phonons in two-dimensional charge-density-wave systems

Abstract

We report on a Raman scattering investigation of the charge-density-wave (CDW), quasi two-dimensional rare-earth tri-tellurides $R$Te${}_3$ ($R$= La, Ce, Pr, Nd, Sm, Gd and Dy) at ambient pressure, and of LaTe${}_3$ and CeTe${}_3$ under externally applied pressure. The observed phonon peaks can be ascribed to the Raman active modes for both the undistorted as well as the distorted lattice in the CDW state by means of a first principles calculation. The latter also predicts the Kohn anomaly in the phonon dispersion, driving the CDW transition. The integrated intensity of the two most prominent modes scales as a characteristic power of the CDW-gap amplitude upon compressing the lattice, which provides clear evidence for the tight coupling between the CDW condensate and the vibrational modes.

References in corpus (4)

• Fermi surface nesting and the origin of Charge Density Waves in metals
• Theory of stripes in quasi two dimensional rare-earth tritellurides
• 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

Cited by in corpus (28)

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• Dynamical slowing down in an ultrafast photo-induced phase transition
• Coexistence and competition of multiple charge-density-wave orders in rare-earth tri-telluride RTe3
• Raman scattering evidence for a cascade-like evolution of the charge-density-wave collective amplitude mode
• Sliding charge-density-wave in two-dimensional rare-earth tellurides
• Coherent order parameter dynamics in SmTe${}_3$
• Two Phonon Interactions and Charge Density Wave in Single Crystalline VSe2 Probed by Raman Spectroscopy
• Revealing extremely low energy amplitude modes in the charge-density-wave compound LaAgSb${}_2$
• Unconventional hysteretic transition in a charge density wave
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• Amplitude dynamics of charge density wave in LaTe${}_3$: theoretical description of pump-probe experiments
• Evidence of phonon-charge-density-waves coupling in ErTe${}_3$
• Temperature dependence of the excitation spectrum in the charge-density-wave ErTe${}_3$ and HoTe${}_3$ systems
• Charge density wave induced nodal lines in LaTe${}_3$
• Classification of Collective Modes in a Charge Density Wave by Momentum-Dependent Modulation of the Electronic Band Structure
• Optical spectroscopy and ultrafast pump-probe study on Bi${}_2$Rh${}_3$Se${}_2$: evidence for charge-density-wave order formation
• Pressure-Induced Re-entrant transition in NbS3 Phases: Combined Raman Scattering and X-ray Diffraction Study
• Pressure dependence of the single particle excitation in the charge-density-wave CeTe${}_3$ system
• Charge density wave modulation and gap measurements in CeTe${}_3$
• Nonlinear order parameter oscillations and lattice coupling in strongly-driven charge-density-wave systems
• Raman spectroscopy study of the interface structure in (CaCuO2)n/(SrTiO3)m superlattices
• Optical spectroscopy study on CeTe${}_3$: evidence for multiple charge-density-wave orders
• Ultrafast measurements under anisotropic strain reveal near equivalence of competing charge orders in TbTe${}_3$
• Temperature dependence of resistivity at the transition to a charge density wave state in rare-earth tritellurides
• Evolution of charge-density-wave soft phonon modes in ${\mathrm{Pd}}_x{\mathrm{ErTe}}_3$
• A detailed first-principles study of the structural, elastic, thermomechanical and optoelectronic properties of binary rare-earth tritelluride NdTe3
• Kramers nodal line in the charge density wave state of YTe${}_3$ and the influence of twin domains