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Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7

Title
Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7
Authors
Lee J.S.Noh T.W.Bae J.S.Yang I.-S.Takeda T.Kanno R.
Ewha Authors
양인상
SCOPUS Author ID
양인상scopus
Issue Date
2004
Journal Title
Physical Review B - Condensed Matter and Materials Physics
ISSN
0163-1829JCR Link
Citation
Physical Review B - Condensed Matter and Materials Physics vol. 69, no. 21, pp. 214428 - 1-214428-5
Indexed
SCOPUS WOS scopus
Document Type
Article
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.
DOI
10.1103/PhysRevB.69.214428
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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