5 papers
Vortex dynamics and pinning properties analysis of MgB2 bulk samples by ac susceptibility measurements
C. Senatore, M. Polichetti, D. Zola +3
The flux lines dynamics have been investigated on MgB2 bulk superconductors obtained by reactive liquid infiltration by measuring the ac magnetic susceptibility. The fundamental an…
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…
A search for incipient lattice instabilities in MgB by anelastic spectroscopy
F. Cordero, R. Cantelli, G. Giunchi +1
We measured the complex dynamic elastic modulus of MgB2 between 1.3 and 650 K at frequencies included between 5 and 70 kHz. The main purpose of this work is to search for possible…
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…