Enhanced flux pinning in neutron irradiated MgB2 -: art. no. 212507

被引：57
|
作者：
Pallecchi, I
Tarantini, C
Aebersold, HU
Braccini, V
Fanciulli, C
Ferdeghini, C
Gatti, F
Lehmann, E
Manfrinetti, P
Marré, D
Palenzona, A
Siri, AS
Vignolo, M
Putti, M
机构：
[1] CNR, INFM, LAMIA, Dipartimento Fis, I-16146 Genoa, Italy
[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland
[3] Dipartimento Fis, I-16146 Genoa, Italy
[4] INFM, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.71.212507
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the effect of neutron irradiation on the critical current density J(c) of isotopically pure polycrystalline Mg B-11(2) samples. For fluences in the range 10(17)-10(18) cm(-2), J(c) 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 B-c2 and J(c) is found.
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页数：4
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