A Raman study of the charge-density-wave state in A₀.₃MoO₃ (A = K, Rb)

Title data

Sagar, Dodderi M. ; Fausti, D. ; Yue, S. ; Kuntscher, Christine A. ; van Smaalen, Sander ; van Loosdrecht, Paul H. M.:
A Raman study of the charge-density-wave state in A₀.₃MoO₃ (A = K, Rb).
In: New Journal of Physics. Vol. 10 (2008) . - 023043.
ISSN 1367-2630
DOI: https://doi.org/10.1088/1367-2630/10/2/023043

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Abstract in another language

We report a comparative Raman spectroscopic study of the quasi-one-dimensional charge-density-wave (CDW) systems A 0.₃MoO₃ (A = K, Rb). Temperature- and polarization-dependent experiments reveal charge-coupled vibrational Raman features. The strongly temperature-dependent collective amplitudon modes in the two materials differ by about 3 cm −1 , thus revealing the role of the alkali atom. We discuss the observed vibrational features in terms of the CDW ground state accompanied by a change in the crystal symmetry. A frequency-kink in some modes seen in K0.₃MoO₃ between T = 80 and 100 K supports the first-order lock-in transition, unlike the case of Rb0.₃MoO₃. 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 CDW gap.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Former Professors
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	24 Nov 2015 09:10
Last Modified:	10 Jan 2025 09:58
URI:	https://eref.uni-bayreuth.de/id/eprint/22947