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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Types of single particle symmetry breaking in transition metal oxides due to electron correlation
TL;DR: Wave functions are calculated for small transition metal oxide molecules using reduced density matrices to study the underlying correlation of electrons, which manifests itself in 2-electron hopping term that is off-diagonal.
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Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
TL;DR: In this paper, high-sensitivity microwave surface impedance measurements of the in-plane penetration depth λ ab in single crystals of electron-doped PrFeAsO 1 - y ( y ∼ 0.1 ) and holedoped Ba 1 - x K x Fe 2 As 2 ( x ≈ 0.55 ) are presented, indicating that the superconducting gap opens all over the Fermi surface.
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Hidden ($\pi$,0) instability as an itinerant origin of bicollinear antiferromagnetism in Fe$_{1+x}$Te
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Coherence Effect of Sign-Reversing s±-Wave Cooper Pair State in Heavily Overdoped LaFeAsO-based Superconductor: 75As-Nuclear Quadrupole Resonance
Hidekazu Mukuda,Mariko Nitta,Mitsuharu Yashima,Yoshio Kitaoka,P. M. Shirage,Hiroshi Eisaki,Akira Iyo +6 more
TL;DR: In this article, an electron-doped LaFeAsO 1-x F x (La1111) with T c = 5 K was studied and the sign reversal of the gap functions on different FSs is realized in La1111 compounds.
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Effects of Pair-Hopping Coupling on Properties of Multi-Band Iron-Based Superconductors
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