Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1-x F x
Reads0
Chats0
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
Citations
More filters
Journal ArticleDOI
Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
TL;DR: The electronic specific heat of annealed single-crystals of FeSe1-xTex (0.6-0.9) has been investigated in this paper, and it has been shown that the electronic superconductivity is of the strong coupling.
Journal ArticleDOI
Synthesis and physical properties of laO1-xFxFeAs
A. Kondrat,J. E. Hamann-Borrero,N. Leps,M. Kosmala,O. Schumann,A. Köhler,J. Werner,G. Behr,Markus Braden,Rüdiger Klingeler,Bernd Büchner,C. Hess +11 more
TL;DR: In this article, the newly discovered Fe-based superconducting material LaO1-xFxFeAs (0 ≤ x ≤ 0.2) in polycrystalline form was investigated by means of structural, thermodynamic and transport measurements.
Journal ArticleDOI
Probing transport mechanisms of BaFe 2 As 2 superconducting films and grain boundary junctions by noise spectroscopy
Carlo Barone,Francesco Romeo,Sergio Pagano,M. Adamo,Ciro Nappi,Ettore Sarnelli,Fritz Kurth,Kazumasa Iida +7 more
TL;DR: The dc transport and voltage-noise properties of Co-doped BaFe2As2 superconducting films with artificial grain boundary junctions have been investigated and possible theoretical interpretation of these phenomena is proposed.
Journal ArticleDOI
Eliashberg analysis of optical spectra reveals a strong coupling of charge carriers to spin fluctuations in doped iron-pnictide BaFe 2 As 2 superconductors
TL;DR: In this article, the temperature and frequency dependences of the optical conductivity of Co-doped BaFe and As are analyzed and the electron-boson spectral density is extracted using Eliashberg's formalism.
Journal ArticleDOI
Microscopically derived multi-component Ginzburg–Landau theories for s+is superconducting state
TL;DR: In this article, the authors considered the case of an interband dominated pairing with repulsion between different bands, and provided detailed analysis of the ground state, length scales and topological properties of that model.