Physics – Condensed Matter – Superconductivity
Scientific paper
2005-06-29
Phys. Rev. B 71,1 (2005)
Physics
Condensed Matter
Superconductivity
13 pages, 3 igures
Scientific paper
10.1103/PhysRevB.71.212507
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 enhanced and its dependence on magnetic field is significantly improved: we demonstrate that, in this regime, point-like pinning centers are effectively introduced in the system proportionally to the neutron fluence. Instead, for larger fluences, a strong suppression of the critical temperature accompanied by a decrease of both the upper critical field Bc2 and Jc is found.
Aebersold H. U.
Braccini Valeria
Fanciulli Carlo
Ferdeghini Carlo
Gatti Fabien
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