The origin of multiple superconducting gaps in MgB2
文献类型：期刊论文
| 作者 | Souma, S ; Machida, Y ; Sato, T ; Takahashi, T ; Matsui, H ; Wang, SC ; Ding, H ; Kaminski, A ; Campuzano, JC ; Sasaki, S ; Kadowaki, K |
| 刊名 | NATURE
 |
| 出版日期 | 2003 |
| 卷号 | 423期号:6935页码:65 |
| 关键词 | POINT-CONTACT SPECTROSCOPY ART. NO. 157002 PHOTOEMISSION SPECTROSCOPY BI2SR2CACU2O8 BORON |
| ISSN号 | 0028-0836 |
| 通讯作者 | Takahashi, T (reprint author), Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan. |
| 中文摘要 | Magnesium diboride, MgB2, has the highest transition temperature (T-c = 39 K) of the known metallic superconductors(1). Whether the anomalously high T-c can be described within the conventional BCS (Bardeen-Cooper-Schrieffer) framework 2 has been debated. The key to understanding superconductivity lies with the 'superconducting energy gap' associated with the formation of the superconducting pairs. Recently, the existence of two kinds of superconducting gaps in MgB2 has been suggested by several experiments(3-9); this is in contrast to both conventional and high-T-c superconductors. A clear demonstration of two gaps has not yet been made because the previous experiments lacked the ability to resolve the momentum of the superconducting electrons. Here we report direct experimental evidence for the two-band superconductivity in MgB2, by separately observing the superconducting gaps of the sigma and pi bands (as well as a surface band). The gaps have distinctly different sizes, which unambiguously establishes MgB2 as a two-gap superconductor(10,11). |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-02-20 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/57952]  |
| 专题 | 物理研究所_所内人员在其他单位发表论文题录信息_所内人员在其他单位发表论文题录信息_期刊论文 |
| 推荐引用方式 GB/T 7714 | Souma, S,Machida, Y,Sato, T,et al. The origin of multiple superconducting gaps in MgB2[J]. NATURE,2003,423(6935):65. |
| APA | Souma, S.,Machida, Y.,Sato, T.,Takahashi, T.,Matsui, H.,...&Kadowaki, K.(2003).The origin of multiple superconducting gaps in MgB2.NATURE,423(6935),65. |
| MLA | Souma, S,et al."The origin of multiple superconducting gaps in MgB2".NATURE 423.6935(2003):65. |
入库方式： OAI收割
来源：物理研究所
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