文章基本信息

标题：Characteristic two-dimensional Fermi surface topology of high-T_c iron-based superconductors
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作者：Masanori Sunagawa ; Toshihiko Ishiga ; Koji Tsubota 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04381
出版社：Springer Nature
摘要：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 AEFe₂As₂ 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.