Spatial variations of the superconductor gap structure in MgB2/Al composite

Details Spatial variations of the superconductor gap structure in MgB2/Al composite Spatial variations of the superconductor gap structure in MgB2/Al composite

2001-03-20

arxiv.org/abs/cond-mat/0103407v3

J. Phys.:Condens. Matter 13, L503 (2001)

Physics

Condensed Matter

Superconductivity

accepted to Journal of Physics Condensed Matter, revised version

Scientific paper

10.1088/0953-8984/13/22/109

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.

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