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Surface and bulk electronic structure of aluminium diboride

Research output: Contribution to journalArticlepeer-review

Author(s)

Veronika Sunko, D. Milosavljević, F. Mazzola, Oliver Jon Clark, U. Burkhardt, T. K. Kim, H. Rosner, Yu. Grin, Andrew Mackenzie, Phil King

School/Research organisations

Abstract

We report a combined experimental and theoretical study of the surface and bulk electronic structure of aluminium diboride, a non-superconducting sister compound of the superconductor MgB2. We perform angle-resolved photoemission measurements with variable photon energy, and compare them with density functional theory calculations, in order to disentangle the surface and bulk contributions to the measured spectra. Aluminium diboride is known to be aluminium deficient, Al1−δB2, 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 MgB2, remain more than 600meV 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 70meV, and demonstrate how surface hole-doping can bring these across the Fermi level.
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Original languageEnglish
Article number035143
Number of pages9
JournalPhysical Review. B, Condensed matter and materials physics
Volume102
DOIs
Publication statusPublished - 22 Jul 2020

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