A Raman study of the Charge-Density-Wave State in A$ {0.3}$MoO$ 3$ A = K,Rb - Condensed Matter > Strongly Correlated ElectronsReport as inadecuate




A Raman study of the Charge-Density-Wave State in A$ {0.3}$MoO$ 3$ A = K,Rb - Condensed Matter > Strongly Correlated Electrons - Download this document for free, or read online. Document in PDF available to download.

Abstract: We report a comparative Raman spectroscopic study of thequasi-one-dimensional charge-density-wave systems \ab A = K, Rb. Thetemperature and polarization dependent experiments reveal charge-coupledvibrational Raman features. The strongly temperature-dependent collectiveamplitudon mode in both materials differ by about 3 cm, thus revealing the roleof alkali atom. We discus the observed vibrational features in terms ofcharge-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 supportsthe first-order lock-in transition, unlike b. The unusually sharp Ramanlineslimited by the instrumental response at very low temperatures and theirtemperature evolution suggests that the decay of the low energy phonons isstrongly influenced by the presence of the temperature dependent charge densitywave gap.



Author: D. M. Sagar, D. Fausti, S. Yue, C. A. Kuntscher, S. van Smaalen, P. H. M. van Loosdrecht

Source: https://arxiv.org/







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