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Raman scattering study of the geometrically frustrated pyrochlore Y2Ru2O7
- Title
- Raman scattering study of the geometrically frustrated pyrochlore Y2Ru2O7
- Authors
- Bae J.S.; Yang I.-S.; Lee J.S.; Noh T.W.; Takeda T.; Kanno R.
- Ewha Authors
- 양인상
- SCOPUS Author ID
- 양인상
- Issue Date
- 2006
- Journal Title
- Vibrational Spectroscopy
- ISSN
- 0924-2031
- Citation
- Vibrational Spectroscopy vol. 42, no. 2, pp. 284 - 287
- Indexed
- SCI; SCIE; SCOPUS
- Document Type
- Article
- Abstract
- Geometrically frustrated pyrochlore Y2Ru2O7, which shows a spin-glass-like transition at TG ∼ 80 K, were investigated by temperature-dependent Raman scattering. Three discernable phonons appear around 315, 410, and 510 cm-1 without any abrupt change in the number of Raman active modes within the temperature range of 10-300 K. Fitting each phonon with Lorentz oscillators, we analyzed the effects of temperature on the phonon frequencies and the linewidths. The temperature-dependence of the mode near 510 cm-1 shows abnormal behavior below TG, while the other two phonons follow the usual thermal effect of lattice vibration. This behavior can be understood in terms of spin-phonon coupling. Considering the atomic modulations of each phonon mode, it is conjectured that the 510 cm-1 phonon mode is isotropically coupled to the spin degree of freedom, while the other modes are not. © 2006 Elsevier B.V. All rights reserved.
- DOI
- 10.1016/j.vibspec.2006.05.004
- Appears in Collections:
- 자연과학대학 > 물리학전공 > Journal papers
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