Physics – Condensed Matter – Superconductivity
Scientific paper
2003-09-24
Supercond. Sci. Technol. 17, S93-S100 (2004)
Physics
Condensed Matter
Superconductivity
11 pages, 7 figures; Proceedings of 6th EUCAS Conference (14-18 September 2003, Sorrento - Italy)
Scientific paper
10.1088/0953-2048/17/5/001
In this paper we highlight the advantages of using point-contact spectroscopy (PCS) in multigap superconductors like MgB_2, both as a fundamental research tool and as a non-destructive diagnostic technique for the optimization of thin-film characteristics. We first present some results of crucial fundamental interest obtained by directional PCS in MgB_2 single crystals, for example the temperature dependence of the gaps and of the critical fields and the effect of a magnetic field on the gap amplitudes. Then, we show how PCS can provide useful information about the surface properties of MgB_2 thin films (e.g. Tc, gap amplitude(s), clean or dirty-limit conditions) in view of their optimization for the fabrication of tunnel and Josephson junctions for applications in superconducting electronics.
Calzolari Arrigo
Daghero Dario
Dellarocca Valeria
Ferdeghini Carlo
Ferrando V.
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