Bulk band gaps in divalent hexaborides: A soft x-ray emission
- Author(s): Denlinger, Jonathan D.;
- Gweon, Gey-Hong;
- Allen, James W.;
- Bianchi, Andrea D.;
- Fisk, Zachary
- et al.
Boron K-edge soft x-ray emission and absorption are used to address the fundamental question of whether divalent hexaborides are intrinsic semimetals or defect-doped bandgap insulators. These bulk sensitive measurements, complementary and consistent with surface-sensitive angle-resolved photoemission experiments, confirm the existence of a bulk band gap and the location of the chemical potential at the bottom of the conduction band.