Hole superconductivity in Arsenic-Iron compounds

Abstract

Superconductivity above 25K, and possibly above 40K, has recently been discovered in $La{O}_{1-x}{F}_{x}FeAs$ and related compounds. We propose that this is another example of the mechanism of hole superconductivity at play. This requires the existence of hole carriers at the Fermi energy, which appears to contradict current observations. We propose that two-band conduction is taking place in these materials, that the negative ion $A{s}^{-3}$ plays a key role, and that superconductivity is non-phononic and driven by pairing and undressing of heavily dressed hole carriers to lower their kinetic energy. We make several predictions of future observations based on our theory.

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• BCS theory of superconductivity: the world's largest Madoff scheme?
• Scanning tunneling spectroscopy of SmFeAsO0.85: Possible evidence for d-wave order parameter symmetry
• Nodal Superconductivity with Multiple Gaps in SmFeAsO${}_{0.9}$F${}_{0.1}$
• Hole superconductivity in $H_{2}S$ and other sulfides under high pressure
• Hole superconductivity in infinite-layer nickelates
• Electronic polarons and bipolarons in Fe-based superconductors: a pairing mechanism
• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• A new family of iron pnictides: BaFeAs2 and BaFeSb2
• Understanding electron-doped cuprate superconductors as hole superconductors
• Materials and mechanisms of hole superconductivity
• High-pressure growth of fluorine-free SmFeAsO${}_{1-x}$ superconducting single crystals
• Charge expulsion, Spin Meissner effect, and charge inhomogeneity in superconductors
• Effect of orbital relaxation on the band structure of cuprate superconductors and implications for the superconductivity mechanism
• Pressure Effects on the Superconducting and Spin-Density-Wave States of the Newly Discovered Sm(O1-xFx)FeAs
• Why only hole conductors can be superconductors
• Towards an understanding of hole superconductivity
• Absence of Josephson coupling between certain superconductors