Intrinsic granularity in nanocrystalline boron-doped diamond films measured by scanning tunneling microscopy Universiteit Hasselt KU Leuven
We report on low-temperature scanning tunneling microscopy/spectroscopy experiments performed on superconducting boron-doped nanocrystalline diamond (NCD) thin films prepared by chemical-vapor deposition methods. The most representative sample reveals the observed superconducting gap (Delta) highly modulated over a length scale on the order of similar to 30 nm, which is much shorter than the typical diamond grain size. The sample local and ...