Hole superconductivity in Arsenic-Iron compounds

Details Hole superconductivity in Arsenic-Iron compounds Hole superconductivity in Arsenic-Iron compounds

2008-03-31

arxiv.org/abs/0804.0002v1

Physica C 468, 1047 (2008)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.physc.2008.05.051

Superconductivity above 25K, and possibly above 40K, has recently been discovered in $LaO_{1-x}F_xFeAs$ 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 $As^{-3}$ 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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