Characteristic two-dimensional Fermi surface topology of high-Tc iron-based superconductors

Masanori Sunagawa, Toshihiko Ishiga, Koji Tsubota, Taihei Jabuchi, Junki Sonoyama, Keita Iba, Kazutaka Kudo, Minoru Nohara, Kanta Ono, Hiroshi Kumigashira, Tomohiro Matsushita, Masashi Arita, Kenya Shimada, Hirofumi Namatame, Masaki Taniguchi, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

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Abstract

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-Tc). 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 Tc = 45 K, which is the highest Tc 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-Tc superconductors.

Original languageEnglish
Article number4381
JournalScientific reports
Volume4
DOIs
Publication statusPublished - Mar 14 2014

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Sunagawa, M., Ishiga, T., Tsubota, K., Jabuchi, T., Sonoyama, J., Iba, K., Kudo, K., Nohara, M., Ono, K., Kumigashira, H., Matsushita, T., Arita, M., Shimada, K., Namatame, H., Taniguchi, M., Wakita, T., Muraoka, Y., & Yokoya, T. (2014). Characteristic two-dimensional Fermi surface topology of high-Tc iron-based superconductors. Scientific reports, 4, [4381]. https://doi.org/10.1038/srep04381