Enhanced flux pinning in neutron irradiated MgB2

Abstract

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.

arXiv comment13 pages, 3 igures

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Cited by in corpus (10)

• Effects of neutron irradiation on polycrystalline Mg11B2
• Superconducting and Normal State Properties of Neutron Irradiated MgB2
• High critical current density and improved flux pinning in bulk MgB2 synthesized by Ag addition
• Enhancement of flux pinning and high critical current density in graphite doped MgB2 superconductor
• Hydrostatic pressure induced transition from δTc to δl pinning mechanism in MgB2
• MgB2 coated superconducting tapes with high critical current densities fabricated by hybrid physical-chemical vapor deposition
• Depinning frequency in a heavily neutron-irradiated MgB2 sample
• Effect of $\alpha$-particle irradiation on a NdFeAs(O,F) thin film
• Microwave surface resistance of pristine and neutron-irradiated MgB2 samples in magnetic field
• The influence of weak texture on the critical currents in polycrystalline MgB${}_2$