Enhanced flux pinning in neutron irradiated MgB2

Details Enhanced flux pinning in neutron irradiated MgB2 Enhanced flux pinning in neutron irradiated MgB2

2005-06-29

arxiv.org/abs/cond-mat/0506750v1

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.

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