Tunneling spectroscopy in small grains of superconducting MgB2

Details Tunneling spectroscopy in small grains of superconducting MgB2 Tunneling spectroscopy in small grains of superconducting MgB2

2001-02-13

arxiv.org/abs/cond-mat/0102242v2

Physics

Condensed Matter

Superconductivity

3 pages with 3 figures, resubmitted to Phys.Rev.Lett 28-February

Scientific paper

10.1103/PhysRevLett.86.5582

We report on tunneling spectroscopy experiments in small grains of the new binary intermetallic superconductor MgB2. Experiments have been performed at 2.5 K using a low temperature scanning tunneling microscope. Good fit to the BCS model is obtained, with a gap value of 2 meV. In the framework of this model, this value should correspond to a surface critical temperature of 13.2 K. No evidence of gap anisotropy has been found.

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