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18 April 2024

» arxiv » cond-mat/0506750

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Enhanced flux pinning in neutron irradiated MgB2
I.Pallecchi ; C.Tarantini ; H.U.Aebersold ; V.Braccini ; C.Fanciulli ; C.Ferdeghini ; F.Gatti ; E.Lehmann ; P.Manfrinetti ; D.Marre’ ; A.Palenzona ; A.S.Siri ; M.Vignolo ; M. Putti ;
Date:	29 Jun 2005
Journal:	Phys. Rev. B (2005)
Subject:	Superconductivity \| cond-mat.supr-con
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.
Source:	arXiv, cond-mat/0506750
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