Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7

J. S. Lee, T. W. Noh, J. S. Bae, In Sang Yang, T. Takeda, R. Kanno

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Abstract

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.

Original languageEnglish
Article number214428
Pages (from-to)214428-1-214428-5
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number21
DOIs
StatePublished - Jun 2004

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