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

doi:10.1038/srep04381

Characteristic two-dimensional Fermi surface topology of high-T_c 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-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.

Original language	English
Article number	4381
Journal	Scientific reports
Volume	4
DOIs	https://doi.org/10.1038/srep04381
Publication status	Published - 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-T_c iron-based superconductors. Scientific reports, 4, Article 4381. https://doi.org/10.1038/srep04381

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-T_c iron-based superconductors', Scientific reports, vol. 4, 4381. https://doi.org/10.1038/srep04381

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title = "Characteristic two-dimensional Fermi surface topology of high-Tc iron-based superconductors",

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.",

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

note = "Funding Information: We acknowledge S. Nagira and H. Fujiwara for technical assistance and Y. Inada for Laue x-ray diffraction experiments. We thank K. Kuroki for the valuable discussions. We also thank A. Ino and R. Yoshida for their ARPES data analysis program. Polarization dependent ARPES experiments at HSRC were performed with the approval of HSRC (Proposal No. 13-A-4). ARPES experiments at the Photon Factory were approved by the Photon Factory Program Advisory Committee (Proposal No. 2011G086). Part of this work was performed at the Advanced Science Research Center at Okayama University. This work was partially supported by MEXT KAKENHI Grant Number 20102003 and JSPS Grant Number 25400372. This work was also partially supported by the Funding Program for World-Leading Innovative R&D in Science and Technology (FIRST program) from JSPS and the program for promoting the enhancement of research universities from MEXT.",

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doi = "10.1038/srep04381",

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AU - Sunagawa, Masanori

AU - Ishiga, Toshihiko

AU - Tsubota, Koji

AU - Jabuchi, Taihei

AU - Sonoyama, Junki

AU - Iba, Keita

AU - Kudo, Kazutaka

AU - Nohara, Minoru

AU - Ono, Kanta

AU - Kumigashira, Hiroshi

AU - Matsushita, Tomohiro

AU - Arita, Masashi

AU - Shimada, Kenya

AU - Namatame, Hirofumi

AU - Taniguchi, Masaki

AU - Wakita, Takanori

AU - Muraoka, Yuji

AU - Yokoya, Takayoshi

N1 - Funding Information: We acknowledge S. Nagira and H. Fujiwara for technical assistance and Y. Inada for Laue x-ray diffraction experiments. We thank K. Kuroki for the valuable discussions. We also thank A. Ino and R. Yoshida for their ARPES data analysis program. Polarization dependent ARPES experiments at HSRC were performed with the approval of HSRC (Proposal No. 13-A-4). ARPES experiments at the Photon Factory were approved by the Photon Factory Program Advisory Committee (Proposal No. 2011G086). Part of this work was performed at the Advanced Science Research Center at Okayama University. This work was partially supported by MEXT KAKENHI Grant Number 20102003 and JSPS Grant Number 25400372. This work was also partially supported by the Funding Program for World-Leading Innovative R&D in Science and Technology (FIRST program) from JSPS and the program for promoting the enhancement of research universities from MEXT.

PY - 2014/3/14

Y1 - 2014/3/14

N2 - 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.

AB - 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.

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

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