Surface and bulk electronic structure of aluminium diboride

V. Sunko; D. Milosavljevic; F. Mazzola; O. J. Clark; U. Burkhardt; T. K. Kim; H. Rosner; Yu. Grin; A. P. Mackenzie; P. D. C. King

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Surface and bulk electronic structure of aluminium diboride

机译：铝二硼化物的表面和散装电子结构

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We report a combined experimental and theoretical study of the surface and bulk electronic structure of aluminium diboride, a nonsuperconducting sister compound of the superconductor MgB_2. We perform angle-resolved photoemission measurements with variable photon energy, and compare them to density functional theory calculations to disentangle the surface and bulk contributions to the measured spectra. Aluminium diboride is known to be aluminium deficient. Al_(1-δ) B_2. which would be expected to lead to a hole doping as compared to the nominally stoichimoetric compound. Nonetheless, we find that the bulk σ states, which mediate superconductivity in MgB_2. remain more than 600 meV below the Fermi level. However, we also observe σ states originating from the boron terminated surface, with an order of magnitude smaller binding energy of 70 meV, and demonstrate how surface hole-doping can bring these across the Fermi level.

机译：我们举报了铝二硼化铝表面和散装电子结构的组合实验和理论研究，超导体MGB_2的非琥珀姐妹化合物。我们使用可变光子能量执行角度分辨的光曝光测量，并将它们与密度泛函理论计算进行比较，以解散到测量光谱的表面和散装贡献。已知二硼化铝是铝缺陷的。 AL_（1-Δ）B_2。与名义上的化学化合物相比，预计将导致孔掺杂。尽管如此，我们发现散装Σ状态，其中在MGB_2中介导超导。在费米水平以下仍然超过600 mev。然而，我们还观察到始致从硼终止表面的σ状态，其数量级较小的约束力为70meV，并展示了表面孔掺杂如何将这些跨越Fermi水平。

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《Physical review》 |2020年第3期|035143.1-035143.9|共9页
作者
V. Sunko; D. Milosavljevic; F. Mazzola; O. J. Clark; U. Burkhardt; T. K. Kim; H. Rosner; Yu. Grin; A. P. Mackenzie; P. D. C. King;
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Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

Diamond Light Source Harwell Campus Didcot OX 11 0DE United Kingdom;

Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany;

Max Planck Institute for Chemical Physics of Solids Noethnitzer Strasse 40 01187 Dresden Germany SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

SUPA School of Physics and Astronomy University of St Andrews St Andrews KY16 9SS United Kingdom;

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Surface and bulk electronic structure of aluminium diboride

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