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Surface and bulk electronic structure of aluminium diboride

DOI: 10.1103/PhysRevB.102.035143 DOI Help

Authors: V. Sunko (Max Planck Institute for Chemical Physics of Solids; University of St Andrews) , D. Milosavljević (Max Planck Institute for Chemical Physics of Solids) , F. Mazzola (University of St Andrews) , O. J. Clark (University of St Andrews) , U. Burkhardt (Max Planck Institute for Chemical Physics of Solids) , T. K. Kim (Diamond Light Source) , H. Rosner (Max Planck Institute for Chemical Physics of Solids) , Yu. Grin (Max Planck Institute for Chemical Physics of Solids) , A. P. Mackenzie (Max Planck Institute for Chemical Physics of Solids; University of St Andrews) , P. D. C. King (University of St Andrews)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 102

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 18705

Open Access Open Access

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 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.

Journal Keywords: Electronic structure; Angle-resolved photoemission spectroscopy; Density functional theory

Subject Areas: Materials, Physics


Instruments: I05-ARPES

Documents:
PhysRevB.102.035143.pdf