Critical fields and anisotropy of NdFeAsO0.82F0.18 single crystals

被引：167

作者：

Jia, Ying ^{[1
]}

Cheng, Peng ^{[1
]}

Fang, Lei ^{[1
]}

Luo, Huiqian ^{[1
]}

Yang, Huan ^{[1
]}

Ren, Cong ^{[1
]}

Shan, Lei ^{[1
]}

Gu, Changzhi ^{[1
]}

Wen, Hai-Hu ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 93卷 / 03期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2963361

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

By using flux method, we have grown single crystals of NdFeAsO0.82F0.18 at ambient pressures. Resistive measurements reveal a surprising discovery that the anisotropy Gamma=(m(c)/m(ab))(1/2) is below 5, which is much smaller than the theoretically calculated value. The data measured up to 400 K show a curved feature, which prevents a conjectured linear behavior for an unconventional metal. The upper critical fields determined based on the Werthamer-Helfand-Hohenberg formula [N. R. Werthamer , Phys. Rev. 147, 295 (1966)] are H-c2(ab)(T=0 K)approximate to 304 T and H-c2(c)(T=0 K)approximate to 62-70 T. These high values indicate very encouraging applications of the new superconductors. (C) 2008 American Institute of Physics.

引用

页数：3

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