Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1-x F x
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TLDR
It is argued that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound.Abstract:
We argue that the newly discovered superconductivity in a nearly magnetic, Fe-based layered compound is unconventional and mediated by antiferromagnetic spin fluctuations, though different from the usual superexchange and specific to this compound. This resulting state is an example of extended s-wave pairing with a sign reversal of the order parameter between different Fermi surface sheets. The main role of doping in this scenario is to lower the density of states and suppress the pair-breaking ferromagnetic fluctuations.read more
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A Twisted Ladder: Relating the Fe Superconductors to the High Tc Cuprates
TL;DR: In this article, the authors constructed a two-leg ladder model of an Fe-pnictide superconductor and discussed its properties and relationship with the familiar twoleg cuprate model.
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Predictions of Multiband s± Strong-Coupling Eliashberg Theory Compared to Experimental Data in Iron Pnictides
TL;DR: In this article, the experimental critical temperatures and gap values of the superconducting materials LaFeAsO1−xFx, SmFeAAsO 1−x Fx, Ba1−kxKxFe2As2As 2 were modeled by an effective s-wave three-band Eliashberg model in which the dominant coupling is in the interband channel and the order parameter is nodeless but undergoes a sign reversal between hole and electron bands.
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Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
TL;DR: In this article, a single impurity problem is investigated for multiband s-wave superconductors with different sign order parameters (s ± -wave supercondors) suggested in Fe-pnictide superconductor.
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Observation of Momentum-Confined In-Gap Impurity State in Ba 0.6 K 0.4 Fe 2 As 2 : Evidence for Antiphase s ± Pairing
Peng Zhang,Pierre Richard,Tianmei Qian,Xun Shi,Junzhang Ma,L. K. Zeng,Xiaoping Wang,E. Rienks,Chenglin Zhang,Chenglin Zhang,Pengcheng Dai,Pengcheng Dai,Yi-Zhuang You,Zheng-Yu Weng,Xianxin Wu,Jiangping Hu,Jiangping Hu,Hong Ding +17 more
TL;DR: In this paper, angle-resolved photo-emission spectroscopy of an impurity state located inside the superconducting gap of Ba0.6K0.4Fe2As2 was performed.
Journal ArticleDOI
Pnictogen height as a switch between high-Tc nodeless and low-Tc nodal pairings in the iron-based superconductors
Kazuhiko Kuroki,Kazuhiko Kuroki,Hidetomo Usui,Hidetomo Usui,Seiichiro Onari,Seiichiro Onari,Ryotaro Arita,Hideo Aoki +7 more
TL;DR: In this article, the lattice structure of the Fermi surface was studied theoretically for various iron pnictides and the gap function and the strength of superconducting instability were determined by multiple spin fluctuation modes arising from several nestings among disconnected pieces of the surface.