Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs4Sb12 (R=light rare-earth)
Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs4Sb12 (R=light rare-earth)
复制标题
重费米子填充方钴矿 ROs4Sb12 中低位稀土客体模式的原子动力学（R=轻稀土）
DOI：
10.1103/physrevb.86.195115
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Tsutsui
中科院分区：
文献类型：
--
作者：
J. Kanasaki;H. Tanimura;and K. Tanimura;S. Tsutsui
用非弹性x射线散射方法研究了重费米子填充的Skutterudite-OsSb中客模的原子动力学。比较了填充的Skutterudite SmOsSb和未填充的Skutterudite IrSb的声子色散关系，发现填充的Skutterudite中的客模是未填充的Skutterudite中的附加模。IrSband SmOsSb的色散关系分别与IrSband LaOsSb的从头计算结果符合得很好。用插入到Sb笼中的稀土原子的原子质量和电子数的变化来解释OsSb系列化合物的非弹性x射线散射谱与稀土的关系。非弹性X射线散射和X射线吸收光谱的结合揭示了客模能量与客体自由空间之间的关联。非弹性x射线散射谱的稀土相关性表明，某些OsSb化合物中客体的原子运动以及客模与4电子和传导电子之间的电子-声子耦合参与了重费米子行为。
The atomic dynamics of the guest modes in heavy fermion filled skutteruditesOsSbwere investigated by inelastic x-ray scattering. Comparison of the phonon dispersion relations for the filled skutterudite SmOsSbwith those for the unfilled skutterudite IrSbindicates that the guest modes in filled skutterudites are observed as additional modes in the unfilled skutterudites. The dispersion relations for IrSband SmOsSbagree reasonably well with the results obtained byab initiocalculations for IrSband LaOsSb, respectively. The rare-earth dependence of the inelastic x-ray scattering spectrum in the series ofOsSbcompounds is difficult to interpret in terms of changes in the atomic mass and electron number of the rare-earth atom inserted into the Sb cage. The combination of inelastic x-ray scattering and x-ray absorption spectroscopy reveals a correlation between the guest mode energy and the guest free space in these compounds. The rare-earth dependence of the inelastic x-ray scattering spectrum indicates the mediation of heavy fermion behavior by the atomic motion of the guest in someOsSbcompounds and the electron-phonon coupling between the guest modes with 4-electrons and conduction electrons in the series ofOsSbcompounds.