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arXiv 1506.07482cond-mat.mtrl-sci
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Cr电子结构中表面特征的识别

Identification of the surface features in the electronic structure of Cr

Khadiza Ali, Shyama R. Varier, Deepnarayan Biswas, Srinivas C. Kandukuri, Kalobaran Maiti

摘要:

利用光电子能谱研究了W(110)表面生长的高质量Cr(110)薄膜的电子结构。对不同老化样品的实验揭示了电子结构中表面和体积特征的不同特征。据观察,吸附的氧形成共价键与表面铬原子在较高的温度下,而它们在低温下几乎保持未反应。除了自旋密度波跃迁引起的带折叠在整个体尼尔温度,我们发现一个弱分散的尖锐的功能出现附近的费米能级在低温下,大概是由于相关诱导效应。

英文摘要:

We studied the electronic structure of high quality Cr(110) films grown on W(110) surface employing photoemission spectroscopy. Experiments on the differently aged samples revealed distinct signatures of the surface and bulk features in the electronic structure. It is observed that the adsorbed oxygens form covalent bonds with the surface Cr atoms at higher temperatures, while they remain almost unreacted at low temperatures. In addition to the spin density wave transition induced band folding across the bulk Neel temperature, we discover a weakly dispersing sharp feature emerging near the Fermi level at low temperatures presumably due to correlation induced effects.

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