Evidence for strong 5d electron correlations in the pyrochlore Y2Ir2O7 studied using high-resolution photoemission spectroscopy
Evidence for strong 5d electron correlations in the pyrochlore Y2Ir2O7 studied using high-resolution photoemission spectroscopy
复制标题
DOI：
10.1103/physrevb.77.201102
复制
发表时间：
2008-05-01
影响因子：
3.7
通讯作者：
Sampathkumaran, E. V.
中科院分区：
文献类型：
--
作者：
Singh, R. S.;Medicherla, V. R. R.;Sampathkumaran, E. V.
我们报告了一个不寻常的行为，高度扩展的5d电子在Y2 Ir 2 O 7属于烧绿石家族的巨大电流的兴趣，使用高分辨率的光电子能谱。实验体光谱揭示了一个强烈的较低的哈伯德带的签名，除了在费米能级，EF附近的弱强度。这为5d电子之间的强电子关联提供了直接证据，这与其他Ir化合物中的观察形成鲜明对比。的.电子关联的影响还表现在300 K高分辨谱的i ~ 5 F附近的谱线形状对垂直条ε-ε（F）垂直条（2）的依赖性上。谱线形状在居里温度以下演变为垂直棒ε-ε（F）垂直棒（1.5）依赖性，强调了磁有序相中电子-磁振子耦合的重要性。
We report an unusual behavior of highly extended 5d electrons in Y2Ir2O7 belonging to the pyrochlore family of great current interest, using high-resolution photoemission spectroscopy. The experimental bulk spectra reveal signature of an intense lower Hubbard band in addition to the weak intensities in the vicinity of the Fermi level, EF. This provides direct evidence for strong electron correlation among the 5d electrons, which is in sharp contrast to the observation in other Ir compounds. The. influence of electron correlation is also manifested by close to vertical bar epsilon-epsilon(F)vertical bar(2) dependence of spectral line shape near i5F of the high-resolution spectrum at 300 K. The spectral line shape evolves to a vertical bar epsilon-epsilon(F)vertical bar(1.5) dependence below Curie temperature, emphasizing the importance of electron-magnon coupling in the magnetically ordered phase.