Abrupt change in the energy gap of superconducting Ba1−�K�Fe2As2 single crystals with hole doping
We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1−KFe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ)...
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| Other Authors: | , , , , , , , |
| Format: | article |
| Published: |
2012
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| Online Access: | http://hdl.handle.net/10725/16650 https://doi.org/10.1103/PhysRevB.86.165117 http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php https://journals.aps.org/prb/abstract/10.1103/PhysRevB.86.165117 |
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| Summary: | We performed a laser angle-resolved photoemission spectroscopy (ARPES) study on a wide doping range of Ba1−KFe2As2 (BaK) and precisely determined the doping evolution of the superconducting gaps in this compound. The gap size of the outer hole Fermi-surface (FS) sheet around the Brillouin zone (BZ) center shows an abrupt drop with overdoping (for ≳ 0.6) while the inner and middle FS gaps roughly scale with . This is accompanied by the simultaneous disappearance of the electron FS sheet with similar orbital character at the BZ corner. These results indicate the different contributions of 2−2 and / orbitals to superconductivity in BaK and can hardly be completely reproduced by the available theories on iron-based superconductors. |
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