We study the effect of neutron irradiation on the critical current density Jc of isotopically pure polycrystalline Mg 11B2 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, pointlike 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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Titolo: | Enhanced flux pinning in neutron irradiated MgB2 |
Autori: | |
Data di pubblicazione: | 2005 |
Rivista: | |
Abstract: | We study the effect of neutron irradiation on the critical current density Jc of isotopically pure polycrystalline Mg 11B2 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, pointlike 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. |
Handle: | http://hdl.handle.net/11567/249439 |
Appare nelle tipologie: | 01.01 - Articolo su rivista |