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Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7
- Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7
- Lee J.S.; Noh T.W.; Bae J.S.; Yang I.-S.; Takeda T.; Kanno R.
- Ewha Authors
- SCOPUS Author ID
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- Journal Title
- Physical Review B - Condensed Matter and Materials Physics
- Physical Review B - Condensed Matter and Materials Physics vol. 69, no. 21, pp. 214428 - 1-214428-5
- Document Type
- We investigated temperature-dependent infrared-active transverse phonon modes of geometrically frustrated pyrochlore Y2Ru2O 7, which exhibits a spin-glass-like transition at T G∼80 K. According to previous neutron-scattering experiments, although Y2Ru2O7 does not accompany any static lattice symmetry change, it has an intriguing magnetic ground state with strong antiferromagnetic correlation [M. Ito et al., J. Phys. Soc. Jpn. 69, 888 (2000)]. In our far-infrared spectra, we found seven phonon modes; thermal effects could explain the temperature dependences of three phonons, but not the other four phonons. We found that these abnormal temperature-dependent behaviors could be attributed to a strong antiferromagnetic correlation, not to a structural distortion. Using quantitative analysis, we suggested that the strong spin-phonon coupling effects should play an important role in the intriguing magnetic state of this geometrically frustrated compound.
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