Evolution of Fermi surface and superconducting gap by electron doping in Ba(Fe,Co)2As2

T. Sudayama; Y. Wakisaka; K. Takubo; R. Morinaga; T. J. Sato; M. Arita; H. Namatame; M. Taniguchi; T. Mizokawa

doi:10.1016/j.physc.2009.11.017

Evolution of Fermi surface and superconducting gap by electron doping in Ba(Fe,Co)₂As₂

T. Sudayama^*, Y. Wakisaka, K. Takubo, R. Morinaga, T. J. Sato, M. Arita, H. Namatame, M. Taniguchi, T. Mizokawa

^*この研究の対応する著者

研究成果 › 査読

抄録

We report on an electronic structural study of BaFe_1.7Co _0.3As₂ in heavily electron doped regime of the FeAs-based superconductors. Three hole bands around the zone center are clearly observed and two of them reach the Fermi level (EF) forming two hole pockets. Top of the lowest hole band is located at ∼30 meV below EF showing that it undergoes a pocket-vanishing type Lifshitz transition by electron doping. Around the zone corner, two electron pockets are clearly observed, and the smaller electron pocket is apparently nested with the larger hole pocket at the zone center.

本文言語	English
ページ（範囲）	S449-S451
ジャーナル	Physica C: Superconductivity and its applications
巻	470
号	SUPPL.1
DOI	https://doi.org/10.1016/j.physc.2009.11.017
出版ステータス	Published - 2010 12月
外部発表	はい

ASJC Scopus subject areas

電子材料、光学材料、および磁性材料
凝縮系物理学
エネルギー工学および電力技術
電子工学および電気工学

文献へのアクセス

10.1016/j.physc.2009.11.017

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引用スタイル

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title = "Evolution of Fermi surface and superconducting gap by electron doping in Ba(Fe,Co)2As2",

abstract = "We report on an electronic structural study of BaFe1.7Co 0.3As2 in heavily electron doped regime of the FeAs-based superconductors. Three hole bands around the zone center are clearly observed and two of them reach the Fermi level (EF) forming two hole pockets. Top of the lowest hole band is located at ∼30 meV below EF showing that it undergoes a pocket-vanishing type Lifshitz transition by electron doping. Around the zone corner, two electron pockets are clearly observed, and the smaller electron pocket is apparently nested with the larger hole pocket at the zone center.",

keywords = "Angle-resolved photoemission spectroscopy, Electronic structure, Fe pnictide, FeAs-based superconductor",

author = "T. Sudayama and Y. Wakisaka and K. Takubo and R. Morinaga and Sato, {T. J.} and M. Arita and H. Namatame and M. Taniguchi and T. Mizokawa",

note = "Funding Information: The authors would like to thank Dr. Y. Aiura and Prof. A. Fujimori for informative discussions. This work was supported in part by the Global COE Program “the Physical Sciences Frontier”, MEXT, Japan. ",

year = "2010",

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doi = "10.1016/j.physc.2009.11.017",

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TY - JOUR

T1 - Evolution of Fermi surface and superconducting gap by electron doping in Ba(Fe,Co)2As2

AU - Sudayama, T.

AU - Wakisaka, Y.

AU - Takubo, K.

AU - Morinaga, R.

AU - Sato, T. J.

AU - Arita, M.

AU - Namatame, H.

AU - Taniguchi, M.

AU - Mizokawa, T.

N1 - Funding Information: The authors would like to thank Dr. Y. Aiura and Prof. A. Fujimori for informative discussions. This work was supported in part by the Global COE Program “the Physical Sciences Frontier”, MEXT, Japan.

PY - 2010/12

Y1 - 2010/12

N2 - We report on an electronic structural study of BaFe1.7Co 0.3As2 in heavily electron doped regime of the FeAs-based superconductors. Three hole bands around the zone center are clearly observed and two of them reach the Fermi level (EF) forming two hole pockets. Top of the lowest hole band is located at ∼30 meV below EF showing that it undergoes a pocket-vanishing type Lifshitz transition by electron doping. Around the zone corner, two electron pockets are clearly observed, and the smaller electron pocket is apparently nested with the larger hole pocket at the zone center.

AB - We report on an electronic structural study of BaFe1.7Co 0.3As2 in heavily electron doped regime of the FeAs-based superconductors. Three hole bands around the zone center are clearly observed and two of them reach the Fermi level (EF) forming two hole pockets. Top of the lowest hole band is located at ∼30 meV below EF showing that it undergoes a pocket-vanishing type Lifshitz transition by electron doping. Around the zone corner, two electron pockets are clearly observed, and the smaller electron pocket is apparently nested with the larger hole pocket at the zone center.

KW - Angle-resolved photoemission spectroscopy

KW - Electronic structure

KW - Fe pnictide

KW - FeAs-based superconductor

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DO - 10.1016/j.physc.2009.11.017

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JO - Physica C: Superconductivity and its Applications

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