Anisotropic superconducting properties of aligned MgB2 crystallites

被引：128

作者：

de Lima, OF ^{[1
]}

Ribeiro, RA ^{[1
]}

Avila, MA ^{[1
]}

Cardoso, CA ^{[1
]}

Coelho, AA ^{[1
]}

机构：

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.86.5974

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Samples of aligned MgB2 crystallites have been prepared, allowing for the first time the direct identification of an upper critical field anisotropy H-c2(ab)/H-c2(c) = xi (ab)/xi (c) similar or equal to 1.7, with xi (o,ab) similar or equal to 70 Angstrom, xi (o,c) = 40 Angstrom, and a mass anisotropy ratio m(ab)/m(c) similar or equal to 0.3. A ferromagnetic background signal was identified, possibly related to the raw materials purity.

引用

页码：5974 / 5977

页数：4

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