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26 April 2024 |
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Fermi surface nesting induced strong pairing in iron-based superconductors | | K. Terashima
; Y. Sekiba
; J. H. Bowen
; K. Nakayama
; T. Kawahara
; T. Sato
; P. Richard
; Y.-M. Xu
; L. J. Li
; G. H. Cao
; Z.-A. Xu
; H. Ding
; T. Takahashi
; | | Date: |
19 Dec 2008 | | Abstract: | The discovery of high-temperature superconductivity in iron pnictides raised
the possibility of an unconventional superconducting mechanism in multiband
materials. The observation of Fermi-surface(FS)-dependent nodeless
superconducting gaps suggested that inter-FS interactions may play a crucial
role in superconducting pairing. In the optimally hole-doped
Ba$_{0.6}$K$_{0.4}$Fe$_2$As$_2$, the pairing strength is enhanced
simultaneously (2$Delta$/Tc$sim$7) on the nearly nested FS pockets, i.e. the
inner holelike ($alpha$) FS and the two hybridized electronlike FSs, while the
pairing remains weak (2$Delta$/Tc$sim$3.6) in the poorly-nested outer
hole-like ($eta$) FS. Here we report that in the electron-doped
BaFe$_{1.85}$Co$_{0.15}$As$_2$ the FS nesting condition switches from the
$alpha$ to the $eta$ FS due to the opposite size changes for hole- and
electron-like FSs upon electron doping. The strong pairing strength
(2$Delta$/Tc$sim$6) is also found to switch to the nested $eta$ FS,
indicating an intimate connection between FS nesting and superconducting
pairing, and strongly supporting the inter-FS pairing mechanism in the
iron-based superconductors. | | Source: | arXiv, 0812.3704 | | Services: | Forum | Review | PDF | Favorites | |
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