10 papers · 1 filter
Experimental confirmation of the low B isotope coefficient in MgB2
P. Brotto, M. Tropeano, C. Ferdeghini +4
Recent investigations have shown that the first proposed explanations of the disagreement between experimental and theoretical value of isotope coefficient in MgB2 need to be recon…
Magnetoresistivity in MgB2 as a probe of disorder in p- and s-bands
I. Pallecchi, V. Ferrando, E. Galleani D'Agliano +10
In this paper we present normal state magnetoresistivity data of magnesium diboride epitaxial thin films with different levels of disorder, measured at 42K in magnetic fields up to…
Enhanced flux pinning in neutron irradiated MgB2
I. Pallecchi, C. Tarantini, H. U. Aebersold +11
We study the effect of neutron irradiation on the critical current density Jc of isotopically pure polycrystalline Mg11B2 samples. For fluences in the range 1017-1018 cm-2, Jc is e…
Epitaxial MgB2 thin films on ZrB2 buffer layers: structural characterization by synchrotron radiation
V. Ferrando, C. Tarantini, E. Bellingeri +7
Structural and superconducting properties of magnesium diboride thin films grown by pulsed laser deposition on zirconium diboride buffer layers were studied. We demonstrate that th…
Critical Field of Al-Doped MgB2 Samples: Correlation with the Suppression of Sigma-Band Gap
M. Putti, C. Ferdeghini, M. Monni +7
In this Letter, the study of the effect of Al substitution on the upper critical field, Bc2, in AlxMg1-xB2 samples is presented. We find a straightforward correlation between Bc2 a…
Critical Field of MGB2 : Crossover from Clean to Dirty Regimes
M. Putti, V. Braccini, C. Ferdeghini +5
We have studied the upper critical field, Bc2, in poly-crystalline MgB2 samples in which disorder was varied in a controlled way to carry selectively p and s bands from clean to di…