Spin-Polarized Surface State in EuO(100)

Jürgen Klinkhammer, Martin Schlipf, Fabian Craes, Sven Runte, Thomas Michely, Carsten Busse
2014 Physical Review Letters  
High-quality films of the ferromagnetic semiconductor EuO are grown on epitaxial graphene on Ir(111) and investigated in situ with scanning tunneling microscopy and spectroscopy. Electron scattering at defects leads to standing-wave patterns, manifesting the existence of a surface state in EuO. The surface state is analyzed at different temperatures and energies. We observe a pronounced energy shift of the surface state when cooling down below the Curie temperature T C , which indicates a spin
more » ... h indicates a spin polarization of this state at low temperatures. The experimental results are in agreement with corresponding density functional theory calculations.
doi:10.1103/physrevlett.112.016803 pmid:24483918 fatcat:jgei4o2xirgwxahmqmudnlfxli