Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1-x F x
Kazuhiko Kuroki,Seiichiro Onari,Ryotaro Arita,Hidetomo Usui,Yukio Tanaka,Hiroshi Kontani,Hideo Aoki +6 more
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TLDR
It is concluded that the multiple spin-fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended s-wave Pairing, while d-wave pairing can also be another candidate.Abstract:
For a newly discovered iron-based high ${T}_{c}$ superconductor ${\mathrm{LaFeAsO}}_{1\ensuremath{-}x}{\mathrm{F}}_{x}$, we have constructed a minimal model, where inclusion of all five Fe $d$ bands is found to be necessary. The random-phase approximation is applied to the model to investigate the origin of superconductivity. We conclude that the multiple spin-fluctuation modes arising from the nesting across the disconnected Fermi surfaces realize an extended $s$-wave pairing, while $d$-wave pairing can also be another candidate.read more
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75As and 139La NMR studies on LaFeAs(O1-xFx)
TL;DR: In this paper, experimental results of 75As and 139La nuclear magnetic resonance (NMR) in the layered oxypnictide system LaFeAs ( O 1 - x F x ) ( x = 0.04, 0.07 and 0.11) were reported.
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Robust s(+/-)-wave superconductivity against multi-impurity in iron-based superconductors
TL;DR: In this article, the effects of disorder on electron-doped iron pnictides are investigated systematically based on self-consistent Bogoliubov-de Gennes equations.
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Quasiparticle Interference and Symmetry of Superconducting Order Parameter in Strongly Electron-Doped Iron-based Superconductors
Abstract: Motivated by recent experimental reports of significant spin-orbit coupling (SOC) and a sign-changing order-parameter in the Li$_{1-x}$Fe$_x$(OHFe)$_{1-y}$Zn$_y$Se superconductor with only electron pockets present, we study the possible Cooper-pairing symmetries and their quasiparticle interference (QPI) signatures. We find that each of the resulting states - $s$-wave, $d$-wave and helical $p$-wave - can have a fully gapped density of states (DOS) consistent with angle-resolved photoemission spectroscopy (ARPES) experiments and, due to spin-orbit coupling, are a mixture of spin singlet and triplet components leading to intra- and inter-band features in the QPI signal. Analyzing predicted QPI patterns we find that only the spin-triplet dominated even parity $A_{1g}$ (s-wave) and $B_{2g}$ (d-wave) pairing states are consistent with the experimental data. Additionally, we show that these states can indeed be realized in a microscopic model with atomic-like interactions and study their possible signatures in spin-resolved STM experiments.
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Magnetic Rare-Earth Impurity Resonance Bound States in Iron-Based Superconductors
TL;DR: In this paper, the effect of magnetic impurities on the local quasiparticle density of states (LDOS) in iron-based superconductors was investigated, and the impurity-induced bound states were a probe for the nodal structure of the extended s-wave symmetry in ferropnictides.
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Unconventional superconductivity originating from disconnected Fermi surfaces in iron pnictides
TL;DR: In this paper, the authors construct a minimal model for high T c superconductors with disconnected Fermi surfaces, and apply a five-band RPA to this model.
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