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Hole superconductivity in arsenic–iron compounds

✍ Scribed by F. Marsiglio; J.E. Hirsch

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
259 KB
Volume
468
Category
Article
ISSN
0921-4534

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✦ Synopsis

Superconductivity above 25 K, and possibly above 40 K, has recently been discovered in LaO 1Àx 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 As À3 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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