Polarized Raman scattering study of blue bronze Tl0.3MoO3

✍ Scribed by Di Yin; Qingming Zhang; Jonathon Oiler; Changzhen Li; Rui Xiong; Jing Shi

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 707 KB
• Volume: 405
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/j.physb.2010.05.086

✦ Synopsis

Temperature dependent polarized Raman spectra of quasi-one dimensional blue bronze Tl 0.3 MoO 3 are reported on a frequency range 100-1100 cm À 1 . Frequency shift and splitting in some modes were observed, revealing the role of the alkali atom. Many new modes emerge at 170 K accompanied by charge density wave (CDW) formation, and show gradual temperature dependent intensity and linewidth, implying the second order nature of CDW transition. A frequency ''jump'' is found for many Raman vibrational modes in Tl 0.3 MoO 3 near 110 K, confirming that the transition from an incommensurate to commensurate state occurs around this temperature. In addition, only three stretching vibration modes of terminal Mo-O bonds are observed for (xx) polarizations from 800 to 1100 cm À 1 at 300 K; new modes appear only when the temperature drops below 110 K and are ascribed to the splitting of the mode at 931 cm À 1 due to commensurate state formation.