Nearly isotropic superconductivity in (Ba,K)Fe2As2
文献类型：期刊论文
| 作者 | Yuan, HQ ; Singleton, J ; Balakirev, FF ; Baily, SA ; Chen, GF ; Luo, JL ; Wang, NL |
| 刊名 | NATURE
 |
| 出版日期 | 2009 |
| 卷号 | 457期号:7229页码:565 |
| 关键词 | UPPER CRITICAL-FIELD FERMI-SURFACE |
| ISSN号 | 0028-0836 |
| 通讯作者 | Yuan, HQ (reprint author), Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China. |
| 中文摘要 | Superconductivity was recently observed(1-7) in iron- arsenic- based compounds with a superconducting transition temperature (T-c) as high as 56 K, naturally raising comparisons with the high-T-c copper oxides. The copper oxides have layered crystal structures with quasi- two- dimensional electronic properties, which led to speculation that reduced dimensionality ( that is, extreme anisotropy) is a necessary prerequisite for superconductivity at temperatures above 40 K ( refs 8, 9). Early work on the iron- arsenic compounds seemed to support this view(7,10). Here we report measurements of the electrical resistivity in single crystals of (Ba,K)Fe2As2 in a magnetic field up to 60 T. We find that the superconducting properties are in fact quite isotropic, being rather independent of the direction of the applied magnetic fields at low temperature. Such behaviour is strikingly different from all previously known layered superconductors(9,11), and indicates that reduced dimensionality in these compounds is not a prerequisite for 'high- temperature' superconductivity. We suggest that this situation arises because of the underlying electronic structure of the iron- arsenic compounds, which appears to be much more three dimensional than that of the copper oxides. Extrapolations of low- field single- crystal data incorrectly suggest a high anisotropy and a greatly exaggerated zero- temperature upper critical field. |
| 收录类别 | SCI |
| 资助信息 | DOE BES program 'Science in 100T'; NHMFL-UCGP; National Science Foundation of China; National Basic Research Program of China [973]; Chinese Academy of Sciences; PCSIRT; Ministry of Education of China |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/49775]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Yuan, HQ,Singleton, J,Balakirev, FF,et al. Nearly isotropic superconductivity in (Ba,K)Fe2As2[J]. NATURE,2009,457(7229):565. |
| APA | Yuan, HQ.,Singleton, J.,Balakirev, FF.,Baily, SA.,Chen, GF.,...&Wang, NL.(2009).Nearly isotropic superconductivity in (Ba,K)Fe2As2.NATURE,457(7229),565. |
| MLA | Yuan, HQ,et al."Nearly isotropic superconductivity in (Ba,K)Fe2As2".NATURE 457.7229(2009):565. |
入库方式： OAI收割
来源：物理研究所
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