Para- to ferromagnetic phase transition ofCoS2studied by high-resolution photoemission spectroscopy
Para- to ferromagnetic phase transition ofCoS2studied by high-resolution photoemission spectroscopy
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高分辨率光电子能谱研究 CoS2 的顺磁相变到铁磁相变
DOI：
10.1103/physrevb.63.094415
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发表时间：
2001
影响因子：
3.7
通讯作者：
N. Hamada
中科院分区：
文献类型：
--
作者：
T. Takahashi;Y. Naitoh;Tsugio Sato;T. Kamiyama;Kohta Yamada;H. Hiraka;Y. Endoh;M. Usuda;N. Hamada
我们对CoS 2 在顺铁磁转变过程中进行了温度依赖性超高分辨率（Δ E∼ 7 meV）光电子能谱，发现在E F 附近存在显着的温度引起的光谱变化。与能带结构计算的比较表明，居里温度（120 K）以下光电子发射光谱中E F 处的尖峰归因于交换分裂导致的 e g↓ 子带，表明 e g↓ 带部分填充在铁磁相中。目前的光电发射结果表明，尽管相关效应显着改变了电子结构，但能带结构计算很好地描述了CoS 2 的电子结构和磁性。
We have performed temperature-dependent ultrahigh-resolution (Δ E∼ 7 meV) photoemission spectroscopy on CoS 2 across the para-to ferromagnetic transition and found a remarkable temperature-induced spectral change near E F. Comparison with the band-structure calculation shows that a sharp peak at E F in the photoemission spectrum below Curie temperature (120 K) is ascribed to the e g↓ subband due to the exchange splitting, indicating that the e g↓ band is partially filled in the ferromagnetic phase. The present photoemission results indicate that the electronic structure and the magnetism of CoS 2 are qualitatively well described by the band-structure calculation although the correlation effect substantially modifies the electronic structure.