2014年3月
Characteristic two-dimensional Fermi surface topology of high-T-c iron-based superconductors
SCIENTIFIC REPORTS
- 巻
- 4
- 号
- 開始ページ
- 4381
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/srep04381
- 出版者・発行元
- NATURE PUBLISHING GROUP
Unconventional Cooper pairing originating from spin or orbital fluctuations has been proposed for iron-based superconductors. Such pairing may be enhanced by quasi-nesting of two-dimensional electron and hole-like Fermi surfaces (FS), which is considered an important ingredient for superconductivity at high critical temperatures (high-T-c). However, the dimensionality of the FS varies for hole and electron-doped systems, so the precise importance of this feature for high-T-c materials remains unclear. Here we demonstrate a phase of electron-doped CaFe2As2 (La and P co-doped CaFe2As2) with T-c = 45 K, which is the highest T-c found for the AEFe(2)As(2) bulk superconductors (122-type; AE = Alkaline Earth), possesses only cylindrical hole-and electron-like FSs. This result indicates that FS topology consisting only of two-dimensional sheets is characteristic of both hole-and electron-doped 122-type high-T-c superconductors.
- リンク情報
- ID情報
-
- DOI : 10.1038/srep04381
- ISSN : 2045-2322
- Web of Science ID : WOS:000332798000010