Tunneling spectroscopy in small grains of superconducting MgB(2).
We report on tunneling spectroscopy experiments in small grains of the new binary intermetallic superconductor MgB(2). 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.
Rubio-Bollinger
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Laboratorio de Bajas Temperaturas, Departamento Física de la Materia Condensada C-III, Instituto Universitario de Ciencia de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain.
Suderow
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Vieira
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