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arXiv 0905.3194cond-mat.mtrl-scicond-mat.supr-con
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BaFe2As2(001)的表面几何结构和电子结构

Surface Geometric and Electronic Structure of BaFe2As2(001)

V. B. Nascimento, Ang Li, Dilushan R. Jayasundara, Yi Xuan, Jared O'Neal, Shuheng Pan, T. Y. Chien, Biao Hu, X. B. He, Guorong Li, A. S. Sefat, M. A. McGuire, B… 展开作者

V. B. Nascimento, Ang Li, Dilushan R. Jayasundara, Yi Xuan, Jared O'Neal, Shuheng Pan, T. Y. Chien, Biao Hu, X. B. He, Guorong Li, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus, M. H. Pan, Jiandi Zhang, R. Jin, E. W. Plummer

摘要:

BaFe 2As 2具有新发现的铁基高温超导体的母体化合物的特性。通过结合实空间成像的扫描隧道显微镜/光谱(STM/S)与动量空间定量低能电子衍射(LEED),我们已经确定了分裂的BaFe 2As 2晶体的表面平面作为终止的Fe-As层-超导电性发生的平面。在BaFe 2As 2(001)表面上的LEED和STM/S数据表明有序的砷(As)终止的金属表面没有重构或晶格畸变。令人惊讶的是,STM成像的是与正交结构相关的不同Fe-As轨道,而不是表面平面中的As原子。

英文摘要:

BaFe2As2 exhibits properties characteristic of the parent compounds of the newly discovered iron (Fe)-based high-TC superconductors. By combining the real space imaging of scanning tunneling microscopy/spectroscopy (STM/S) with momentum space quantitative Low Energy Electron Diffraction (LEED) we have identified the surface plane of cleaved BaFe2As2 crystals as the As terminated Fe-As layer - the plane where superconductivity occurs. LEED and STM/S data on the BaFe2As2(001) surface indicate an ordered arsenic (As) - terminated metallic surface without reconstruction or lattice distortion. It is surprising that the STM images the different Fe-As orbitals associated with the orthorhombic structure, not the As atoms in the surface plane.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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