  Composites consisting of MgB2 and Al, 11% by volume, undergo a transition to
superconductivity onset at TC = 38 K, close to the value reported for pure
MgB2. The transition appears to have broadened, as determined by both magnetic
and transport measurements, possible due to the proximity effect and disorder.
Spatially resolved tunneling spectroscopy at 4.2 K exhibit a distribution of
gap structures, from BCS-like spectra with 2D/kBTc = 3.2 to spectra that are
typical for proximity superconductors.
