Angle-resolved photoemission study of heavily electron-doped BaFe 2-xCoxAs2

Y. Sekiba; T. Sato; K. Nakayama; K. Terashima; P. Richard; J. H. Bowen; H. Ding; Y. M. Xu; L. J. Li; G. H. Cao; Z. A. Xu; T. Takahashi

doi:10.1016/j.physc.2009.11.137

Angle-resolved photoemission study of heavily electron-doped BaFe _2-xCo_xAs₂

Y. Sekiba, T. Sato, K. Nakayama, K. Terashima, P. Richard, J. H. Bowen, H. Ding, Y. M. Xu, L. J. Li, G. H. Cao, Z. A. Xu, T. Takahashi

Graduate School of Natural Science and Technology

Research output: Contribution to journal › Article › peer-review

Abstract

We report results of angle-resolved photoemission spectroscopy on a heavily electron-doped BaFe_2-xCo_xAs₂. By using synchrotron-radiation light, we have investigated the band dispersion near the Fermi level (EF) of BaFe_2-xCo_xAs₂ (x = 0.3) for different wave vectors perpendicular to the crystal surface (kz). We find that observed holelike band does not cross EF around Γ or Z point of the Brillouin zone, unlike the optimally- or under-doped samples. The holelike band also shows a finite kz dispersion of about 20 meV. These results indicate that the coexistence of hole and electron pockets connected by the antiferromagnetic wave vector plays an important role to the mechanism of superconductivity.

Original language	English
Pages (from-to)	S394-S396
Journal	Physica C: Superconductivity and its applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.11.137
Publication status	Published - Dec 2010

Keywords

ARPES
Iron-based superconductors

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/j.physc.2009.11.137

Cite this

@article{24a43b9611034e89a8223a03b470f517,

title = "Angle-resolved photoemission study of heavily electron-doped BaFe 2-xCoxAs2",

abstract = "We report results of angle-resolved photoemission spectroscopy on a heavily electron-doped BaFe2-xCoxAs2. By using synchrotron-radiation light, we have investigated the band dispersion near the Fermi level (EF) of BaFe2-xCoxAs2 (x = 0.3) for different wave vectors perpendicular to the crystal surface (kz). We find that observed holelike band does not cross EF around Γ or Z point of the Brillouin zone, unlike the optimally- or under-doped samples. The holelike band also shows a finite kz dispersion of about 20 meV. These results indicate that the coexistence of hole and electron pockets connected by the antiferromagnetic wave vector plays an important role to the mechanism of superconductivity.",

keywords = "ARPES, Iron-based superconductors",

author = "Y. Sekiba and T. Sato and K. Nakayama and K. Terashima and P. Richard and Bowen, {J. H.} and H. Ding and Xu, {Y. M.} and Li, {L. J.} and Cao, {G. H.} and Xu, {Z. A.} and T. Takahashi",

note = "Funding Information: We thank T. Kawahara for his help in the experiment. This work was supported by grants from JSPS, JST-CREST, MEXT of Japan, the Chinese Academy of Sciences, NSF, Ministry of Science and Technology of China and NSF of US. ",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.11.137",

language = "English",

volume = "470",

pages = "S394--S396",

journal = "Physica C: Superconductivity and its Applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "SUPPL.1",

}

TY - JOUR

T1 - Angle-resolved photoemission study of heavily electron-doped BaFe 2-xCoxAs2

AU - Sekiba, Y.

AU - Sato, T.

AU - Nakayama, K.

AU - Terashima, K.

AU - Richard, P.

AU - Bowen, J. H.

AU - Ding, H.

AU - Xu, Y. M.

AU - Li, L. J.

AU - Cao, G. H.

AU - Xu, Z. A.

AU - Takahashi, T.

N1 - Funding Information: We thank T. Kawahara for his help in the experiment. This work was supported by grants from JSPS, JST-CREST, MEXT of Japan, the Chinese Academy of Sciences, NSF, Ministry of Science and Technology of China and NSF of US.

PY - 2010/12

Y1 - 2010/12

N2 - We report results of angle-resolved photoemission spectroscopy on a heavily electron-doped BaFe2-xCoxAs2. By using synchrotron-radiation light, we have investigated the band dispersion near the Fermi level (EF) of BaFe2-xCoxAs2 (x = 0.3) for different wave vectors perpendicular to the crystal surface (kz). We find that observed holelike band does not cross EF around Γ or Z point of the Brillouin zone, unlike the optimally- or under-doped samples. The holelike band also shows a finite kz dispersion of about 20 meV. These results indicate that the coexistence of hole and electron pockets connected by the antiferromagnetic wave vector plays an important role to the mechanism of superconductivity.

AB - We report results of angle-resolved photoemission spectroscopy on a heavily electron-doped BaFe2-xCoxAs2. By using synchrotron-radiation light, we have investigated the band dispersion near the Fermi level (EF) of BaFe2-xCoxAs2 (x = 0.3) for different wave vectors perpendicular to the crystal surface (kz). We find that observed holelike band does not cross EF around Γ or Z point of the Brillouin zone, unlike the optimally- or under-doped samples. The holelike band also shows a finite kz dispersion of about 20 meV. These results indicate that the coexistence of hole and electron pockets connected by the antiferromagnetic wave vector plays an important role to the mechanism of superconductivity.

KW - ARPES

KW - Iron-based superconductors

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DO - 10.1016/j.physc.2009.11.137

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JO - Physica C: Superconductivity and its Applications

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