Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 468, Issue 14, Pages 1047-1052Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2008.05.051
Keywords
hole superconductivity; arsenic-iron compounds; two-band model; tunneling asymmetry
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- ICORE (Alberta)
- Canadian Institute for Advanced Research (CIfAR)
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Superconductivity above 25 K, and possibly above 40 K, has recently been discovered in LaO1-x,FxFeAs 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. (c) 2008 Elsevier B.V. All rights reserved.
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