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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TL;DR: In this paper, the effect of neutrons irradiation on superconducting and normal state properties of polycrystalline LaFeAsO_0.9F 0.1 was investigated.
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Degradation of Superconductivity and Spin Fluctuations by Electron Overdoping in LaFeAsO1-xFx
Shuichi Wakimoto,Katsuaki Kodama,Motoyuki Ishikado,Masaaki Matsuda,Ryoichi Kajimoto,Masatoshi Arai,Kazuhisa Kakurai,Fumitaka Esaka,Akira Iyo,Hijiri Kito,Hiroshi Eisaki,Shin-ichi Shamoto +11 more
TL;DR: In this paper, low-energy spin fluctuations were studied for the electron-doped Fe-based superconductor LaFeAsO 1-x F x by inelastic neutron scattering up to an energy transfer of ω= 15 meV using polycrystalline samples.
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Five new chalcohalides, Ba3GaS4X (X = Cl, Br), Ba3MSe4Cl (M = Ga, In), and Ba7In2Se6F8: syntheses, crystal structures, and optical properties.
TL;DR: Five new chalcohalides, Ba3GaS4X (X = Cl, Br), Ba3MSe4Cl (M = Ga, In), and Ba7In2Se6F8, have been synthesized by conventional high-temperature solid-state method and crystallize in three different interesting structure types.