A Raman study of the Charge-Density-Wave State in A${}_{0.3}$MoO${}_3$ (A = K,Rb)

Abstract

We report a comparative Raman spectroscopic study of the quasi-one-dimensional charge-density-wave systems \ab (A = K, Rb). The temperature and polarization dependent experiments reveal charge-coupled vibrational Raman features. The strongly temperature-dependent collective amplitudon mode in both materials differ by about 3 cm, thus revealing the role of alkali atom. We discus the observed vibrational features in terms of charge-density-wave ground state accompanied by change in the crystal symmetry. A frequency-kink in some modes seen in \bb between T = 80 K and 100 K supports the first-order lock-in transition, unlike \rb. The unusually sharp Raman lines(limited by the instrumental response) at very low temperatures and their temperature evolution suggests that the decay of the low energy phonons is strongly influenced by the presence of the temperature dependent charge density wave gap.

arXiv comment13 pages, 7 figures

References in corpus (7)

• Inelastic Light Scattering From Correlated Electrons
• Single particle and collective excitations in the one-dimensional charge density wave solid K0.3MoO3 probed in real time by femtosecond spectroscopy
• Raman scattering from phonons and magnons in RFe3)BO3)4
• Charge-density-waves and superconductivity as an alternative to phase separation in the infinite-U Hubbard-Holstein model
• Single-particle excitations and phonon softening in the one-dimensional spinless Holstein model
• Coherent amplitudon generation in K_0.3MoO_3 through ultrafast inter-band quasi particle decay
• Doping Effects on the Charge-Density-Wave Dynamics in Blue Bronze

Cited by in corpus (13)

• Electronic crystals: an experimental overview
• Dynamics of photoinduced Charge Density Wave-metal phase transition in K0.3MoO3
• Disentanglement of the electronic and lattice parts of the order parameter in a 1D Charge Density Wave system probed by femtosecond spectroscopy
• Charge density waves and phonon-electron coupling in ZrTe${}_3$ investigated by Raman spectroscopy and first-principles calculations
• Possible observation of parametrically amplified coherent phasons in K0.3MoO3 using time-resolved extreme-ultraviolet ARPES
• A dynamical stability limit for the charge density wave in K0.3MoO3
• Bypassing the structural bottleneck in the ultrafast melting of electronic order
• Pressure-Induced Re-entrant transition in NbS3 Phases: Combined Raman Scattering and X-ray Diffraction Study
• Phase-channel dynamics reveal the role of impurities and screening in a quasi-one-dimensional charge-density wave system
• Combined investigation of collective amplitude and phase modes in a quasi-one-dimensional charge-density-wave system over a wide spectral range
• Charge Density Wave Phase Transition on the Surface of Electrostatically Doped Multilayer Graphene
• Revisitation of the lock-in transition in one-dimensional charge-density waves
• Induced discommensurations in the lock-in transition of charge-density waves