4 papers
High performance new MgB2 superconducting hollow wires
G. Giunchi, S. Ceresara, G. Ripamonti +6
MgB2 hollow wires have been produced with a new technique which uses a conventional wire manufacturing process but is applied to composite billets containing the elemental B and Mg…
Temperature and junction-type dependency of Andreev reflection in MgB2
R. S. Gonnelli, A. Calzolari, D. Daghero +6
We studied the voltage and temperature dependency of the dynamic conductance of normal metal-MgB2 junctions obtained either with the point-contact technique (with Au and Pt tips) o…
Josephson effect in MgB_2 break junctions
R. S. Gonnelli, A. Calzolari, D. Daghero +5
We present the first observation of the DC and AC Josephson effect in MgB_2 break junctions. The junctions, obtained at 4.2 K in high-quality, high-density polycrystalline metallic…
Critical state analysis in MgB2 bulk by means of quantitative MO technique
L. Gozzelino, F. Laviano, D. Botta +8
An extended magneto-optical (MO) analysis of samples cut from high-density pellets of MgB2 is reported. For sake of comparison some magnetic measurements and critical values are al…