Strong spin-phonon coupling in the geometrically frustrated pyrochlore Y2Ru2O7 -: art. no. 214428

被引：57

作者：

Lee, JS ^{[1
]}

Noh, TW

Bae, JS

Yang, IS

Takeda, T

Kanno, R

机构：

[1] Seoul Natl Univ, Sch Phys, Seoul 151747, South Korea

[2] Seoul Natl Univ, Res Ctr Oxide Elect, Seoul 151747, South Korea

[3] Ewha Womans Univ, Dept Phys, Seoul 120750, South Korea

[4] Hokkaido Univ, Div Mat Sci & Engn, Grad Sch Engn, Hokkaido 0608628, Japan

[5] Tokyo Inst Technol, Dept Elect Chem, Interdisciplinary Grad Sch Sci & Engn, Yokohama, Kanagawa 2268502, Japan

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.69.214428

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigated temperature-dependent infrared-active transverse phonon modes of geometrically frustrated pyrochlore Y2Ru2O7, which exhibits a spin-glass-like transition at T(G)similar to80 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 , 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.

引用

页码：214428 / 1

页数：5

共 24 条

[1] Local lattice disorder in the geometrically frustrated spin-glass pyrochlore Y2Mo2O7 [J].