Electronic structure of heavily electron-doped BaFe1.7Co0.3As2studied by angle-resolved photoemission
| Autor: | Yiming Xu, Guanghan Cao, Lanjuan Li, K. Terashima, Kosuke Nakayama, Zhu-An Xu, J. H. Bowen, Y. Sekiba, Takashi Takahashi, Pierre Richard, Hong Ding, Takafumi Sato |
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| Rok vydání: | 2009 |
| Předmět: |
Physics
Superconductivity Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Photoemission spectroscopy Condensed Matter - Superconductivity Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences General Physics and Astronomy Fermi surface Electronic structure Electron Superconductivity (cond-mat.supr-con) Brillouin zone Condensed Matter - Strongly Correlated Electrons Condensed Matter::Superconductivity Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Wave vector |
| Zdroj: | New Journal of Physics. 11:025020 |
| ISSN: | 1367-2630 |
| DOI: | 10.1088/1367-2630/11/2/025020 |
| Popis: | We have performed high-resolution angle-resolved photoemission spectroscopy on heavily electron-doped non-superconducting (SC) BaFe$_{1.7}$Co$_{0.3}$As$_2$. We find that the two hole Fermi surface pockets at the zone center observed in the hole-doped superconducting Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$ are absent or very small in this compound, while the two electron pockets at the M point 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. 5 pages, 4 figures |
| Databáze: | OpenAIRE |
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