Significant enhancement of irreversibility field in clean-limit bulk MgB2

被引:43
作者
Braccini, V
Cooley, LD
Patnaik, S
Larbalestier, DC
Manfrinetti, P
Palenzona, A
Siri, AS
机构
[1] Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53706 USA
[2] INFM LAMIA, Dipartimento Fis, I-16146 Genoa, Italy
[3] Univ Wisconsin, Ctr Appl Superconduct, Madison, WI 53706 USA
[4] INFM LAMIA, Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy
[5] INFM LAMIA, Dept Fis, I-16146 Genoa, Italy
关键词
D O I
10.1063/1.1528289
中图分类号
O59 [应用物理学];
学科分类号
摘要
Low resistivity MgB2 bulk samples annealed in Mg vapor show an increase in irreversibility field mu(0)H(*)(T) by a factor of similar to2 in both transport and magnetic measurements. The best sample displayed a magnetic irreversibility field mu(0)H(M)(*)>14 T at 4.2 K and similar to6 T at 20 K. These changes were accompanied by an increase of the 40 K resistivity from 1 to 18 muOmega cm and a lowering of the resistivity ratio from 15 to 3, while the critical temperature T-c decreased by only 1-2 K. These results show that systematic processing changes can make MgB2 attractive for magnet applications. (C) 2002 American Institute of Physics.
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页码:4577 / 4579
页数:3
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