Electronic structure of heavily electron-doped BaFe1.7Co 0.3AS2 studied by angle-resolved photoemission

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

Research output: Contribution to journalArticle

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Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe1.7Co 0.3As2. We find that the two hole Fermi surface pockets at the Brillouin zone center observed in the hole-doped superconducting Ba 0.6K0.4Fe2As2 are absent or very small in this compound, while the two electron pockets at the zone corner significantly expand due to electron doping by the Co substitution. Comparison of the Fermi surface between non-SC and SC samples indicates that the coexistence of hole and electron pockets connected via the antiferromagnetic wave vector is essential in realizing the mechanism of superconductivity in the iron-based superconductors.

Original languageEnglish
Article number025020
JournalNew Journal of Physics
Volume11
DOIs
Publication statusPublished - Feb 27 2009
Externally publishedYes

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photoelectric emission
electronic structure
Fermi surfaces
electrons
Brillouin zones
superconductivity
substitutes
iron
high resolution
spectroscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Sekiba, Y., Sato, T., Nakayama, K., Terashima, K., Richard, P., Bowen, J. H., ... Takahashi, T. (2009). Electronic structure of heavily electron-doped BaFe1.7Co 0.3AS2 studied by angle-resolved photoemission. New Journal of Physics, 11, [025020]. https://doi.org/10.1088/1367-2630/11/2/025020

Electronic structure of heavily electron-doped BaFe1.7Co 0.3AS2 studied by angle-resolved photoemission. / Sekiba, Y.; Sato, T.; Nakayama, K.; Terashima, Kensei; Richard, P.; Bowen, J. H.; Ding, H.; Xu, Y. M.; Li, L. J.; Cao, G. H.; Xu, Z. A.; Takahashi, T.

In: New Journal of Physics, Vol. 11, 025020, 27.02.2009.

Research output: Contribution to journalArticle

Sekiba, Y, Sato, T, Nakayama, K, Terashima, K, Richard, P, Bowen, JH, Ding, H, Xu, YM, Li, LJ, Cao, GH, Xu, ZA & Takahashi, T 2009, 'Electronic structure of heavily electron-doped BaFe1.7Co 0.3AS2 studied by angle-resolved photoemission', New Journal of Physics, vol. 11, 025020. https://doi.org/10.1088/1367-2630/11/2/025020
Sekiba, Y. ; Sato, T. ; Nakayama, K. ; Terashima, Kensei ; Richard, P. ; Bowen, J. H. ; Ding, H. ; Xu, Y. M. ; Li, L. J. ; Cao, G. H. ; Xu, Z. A. ; Takahashi, T. / Electronic structure of heavily electron-doped BaFe1.7Co 0.3AS2 studied by angle-resolved photoemission. In: New Journal of Physics. 2009 ; Vol. 11.
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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.

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AB - We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe1.7Co 0.3As2. We find that the two hole Fermi surface pockets at the Brillouin zone center observed in the hole-doped superconducting Ba 0.6K0.4Fe2As2 are absent or very small in this compound, while the two electron pockets at the zone corner significantly expand due to electron doping by the Co substitution. Comparison of the Fermi surface between non-SC and SC samples indicates that the coexistence of hole and electron pockets connected via the antiferromagnetic wave vector is essential in realizing the mechanism of superconductivity in the iron-based superconductors.

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