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Surface and bulk electronic structure of aluminium diboride

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Sunko,  V.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Milosavljević,  D.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt,  U.
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Rosner,  H.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Yu.
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  A. P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Sunko, V., Milosavljević, D., Mazzola, F., Clark, O. J., Burkhardt, U., Kim, T. K., et al. (2020). Surface and bulk electronic structure of aluminium diboride. Physical Review B, 102(3): 035143, pp. 1-9. doi:10.1103/PhysRevB.102.035143.


Cite as: http://hdl.handle.net/21.11116/0000-0006-D258-A
Abstract
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 MgB2. 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, Al1-delta B2, which would be expected to lead to a hole doping as compared to the nominally stoichimoetric compound. Nonetheless, we find that the bulk a states, which mediate superconductivity in MgB2, remain more than 600 meV below the Fermi level. However, we also observe a 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.